221k views
4 votes
Amina sees a discount of 5% on a laptop. She can calculate the amount she has to pay for the laptop using the expression where b is the price of the laptop before the discount. If the price after discount is $494, which number from the set {500, 505, 510, 520, 525} is the value of b?

User Minx
by
6.4k points

2 Answers

3 votes

Answer:

$520

Explanation:

Since this is a 5% discount, you must subtract 5 from 100% which is 95%.

This will be written as 0.95.

Expression:
x*0.95=494\\\\0.95x=494\\\\(0.95x)/(0.95) =(494)/(0.95)

The answer will be $520.

User GusSL
by
6.7k points
4 votes

Answer:


\boxed{520}

Explanation:


\begin{array}{rcl}\text{ Price before discount - discount} & = & \text{sale price}\\b-0.05b & = & 494\\0.95b & = & 494\\\\b & = & (494 )/(0.95)\\\\& = & \mathbf{520}\\\end{array}\\\text{The number from the set that matches } b \text{ is }\boxed{\mathbf{520}}

User Hbar
by
6.4k points