Answer:
![Profit = \$250](https://img.qammunity.org/2021/formulas/mathematics/middle-school/3sh26gf39vwbgfovnh3z0z18lcnxn0okk6.png)
Explanation:
Given
Number of Toys = 50
Unit Cost Price = $5.5
Unit Selling price = $15
Required
Determine the profit after sales
First, we need to determine the total cost price;
![Cost\ Price = Number\ of\ toy *\ Unit\ cost\ price](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ku02t9brlivmksy0qxo9ckfblnjyk6c6c3.png)
![Cost\ Price = 50 * \$5.5](https://img.qammunity.org/2021/formulas/mathematics/middle-school/pfj659pw1pyrbbikx87li9csgred82s7vf.png)
![Cost\ Price = \$275](https://img.qammunity.org/2021/formulas/mathematics/middle-school/sybykr0x27qohwvh5tgd6z3cnsr7n6lu64.png)
First, we need to determine the total sales;
____________________________________________________
Half of the toy was sold at $15;
![Half\ of\ the\ toy = (1)/(2) * 50](https://img.qammunity.org/2021/formulas/mathematics/middle-school/v0uf4xz8yhhgvha36mgq5upof3djbao076.png)
![Half\ of\ the\ toy = 25](https://img.qammunity.org/2021/formulas/mathematics/middle-school/981svsj639yi9fulwngpw6gd2d2awet0ug.png)
![Sales = \$15 * 25](https://img.qammunity.org/2021/formulas/mathematics/middle-school/mytmx4grouw74fcdyuh2xvi6g0tqstsjo8.png)
![Sales = \$375](https://img.qammunity.org/2021/formulas/mathematics/middle-school/s9dxk58lszszsglkryriczoisqerhuvstt.png)
____________________________________________________
Two-fifth of the remaining was sold at half of the sales price
From the above calculation;
![Remaining\ Toy = 50 - 25](https://img.qammunity.org/2021/formulas/mathematics/middle-school/xf3v9pqo5qjlhgx9pdrgh0q7amjr4bsejg.png)
![Remaining\ Toy = 25](https://img.qammunity.org/2021/formulas/mathematics/middle-school/a4366eps2fon43bnom0ly4elsp0smqw40e.png)
Calculating Two-fifth of the remaining:
![(2)/(5) * 25](https://img.qammunity.org/2021/formulas/mathematics/middle-school/mntkdxxmgjeczos5vh0p3i84dl4clgqwcx.png)
![= (50)/(5)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/yubi3u4zwpx1f3utvmut1cii1lzx780id5.png)
![= 10](https://img.qammunity.org/2021/formulas/biology/college/6cgdo974r7pqu74f6gbumwtt4geovopa97.png)
Calculating half of the sales price:
![(1)/(2) * \$15](https://img.qammunity.org/2021/formulas/mathematics/middle-school/m8guh9r67cso9tzqoels6wm1agrewuwmrt.png)
![\$7.5](https://img.qammunity.org/2021/formulas/mathematics/middle-school/6vfl8oijmgpi8gy54oofrzd8barhnvmcpp.png)
This means that 10 toys were sold for $7.5
![Sales = 10 * \$7.5](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ce5uttm1yccujoqpbefo0hzo8jm65kq525.png)
![Sales = \$75](https://img.qammunity.org/2021/formulas/mathematics/middle-school/uvxx5rh8mmmjymnz76whql801qb9zca2m4.png)
____________________________________________________
The remaining was sold at one-third of the sales price
From the above calculations (1 & 2);
![Remaining\ Toy = 50 - 25 - 10](https://img.qammunity.org/2021/formulas/mathematics/middle-school/f25u08n2n0cj72djzx2x97bih7cwu8fzlx.png)
![Remaining\ Toy = 15](https://img.qammunity.org/2021/formulas/mathematics/middle-school/6fnrc39fjzba75v41i53dz58orce57eteg.png)
Calculating one-third of the sales price:
![(1)/(3) * \$15](https://img.qammunity.org/2021/formulas/mathematics/middle-school/jkya0j8vi4lenob191bbx52ah7dfighu9j.png)
![\$5](https://img.qammunity.org/2021/formulas/mathematics/middle-school/qt3mxz90cw633pufgw5ljgcal9d8ohchni.png)
This means that 15 toys were sold for $5
![Sales = 15 * \$5](https://img.qammunity.org/2021/formulas/mathematics/middle-school/v30jh1icpue1rm7grz5ovjhuwqzpl3jr7o.png)
![Sales = \$75](https://img.qammunity.org/2021/formulas/mathematics/middle-school/uvxx5rh8mmmjymnz76whql801qb9zca2m4.png)
____________________________________________________
Now the total sales can be calculated;
![Total\ Sales = \$375 + \$75 + \$75](https://img.qammunity.org/2021/formulas/mathematics/middle-school/djtpts8bjpq1lp4p85o4a8txa8162r7ych.png)
![Total\ Sales = \$525](https://img.qammunity.org/2021/formulas/mathematics/middle-school/jss3a1o22km15hb1xyr02llfjxij1etoe4.png)
![Profit = Total\ Sales -\ Cost\ Price](https://img.qammunity.org/2021/formulas/mathematics/middle-school/v6uhkb3e9gq0vy8ddihn42u1xphjxv544f.png)
![Profit = \$525 -\$275](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ioqha7i1j47tz5qcw8buu5sxwgomfc4sne.png)
![Profit = \$250](https://img.qammunity.org/2021/formulas/mathematics/middle-school/3sh26gf39vwbgfovnh3z0z18lcnxn0okk6.png)