Answer:
Josh's total bill is $ 27.825
Explanation:
Given:
The subtotal of the Josh Bill = $21.00
Finding the usual amount Josh gave as Tip To his sever:
Usually josh tips 20% to all servers
So Tip = 20% of his subtotal
=>
![20\% * 21](https://img.qammunity.org/2021/formulas/mathematics/middle-school/dfgrciqmhne9yuq1kmf6yicmo7x3f60yq7.png)
=>
![(20)/(100) * 21](https://img.qammunity.org/2021/formulas/mathematics/middle-school/3ryo98aipo5kel4pjyktume4n479llbke1.png)
=>
![0.2 * 21](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ulrunnkz938juqpo5hbykz19rrag3scjzk.png)
=>4.2
So Josh usually tips $4.2 to his server
Finding the amount Josh gave 25% as Tip To his sever:
But now he tips 25% which is
=> 25% of 21
=>
![(25)/(100) * 21](https://img.qammunity.org/2021/formulas/mathematics/middle-school/hrmwqa4nb6fuxhlncykbkmqoqppke8s3xu.png)
=>
![0.25 * 21](https://img.qammunity.org/2021/formulas/mathematics/middle-school/i116fbrx4vqidqtj4oyrhk3ok5ou7ywmrs.png)
=> 5.25
Thus the tip amount will be $5.25
So he will be giving (5.25 - 4.2) = $1.05 more than the usual tip
Finding the total bill
The total bill = subtotal+ 7.5% sales tax + 25% tip
=> 21 + 7.5 % of 21 + 25% of 21
=>
![21 + (75)/(100) * 21 + (25)/(100) * 21](https://img.qammunity.org/2021/formulas/mathematics/middle-school/clvvfhtzaqbf1bxmwlgxcsq0s6f8l954qw.png)
=>
![21 +0.075 * 21 + 0.25 * 21](https://img.qammunity.org/2021/formulas/mathematics/middle-school/5vxkaz92rngj7r6d2xdmz92pd8gifq0vrm.png)
=> 21 +1.575 +5.25
=>27.825