(a) 7.5% of what number is 7.38?
(b) what percent of 12.5 is 39

a)  The answer is:  98.4 . 
 
     7.5% of 98.4 is 7.38 .

Explanation:


7.5% * x = 7.38?  Solve for "x".

7.5% = 7.5÷100 = 0.075 .

(0.075)x = 7.38  ; Solve for "x" ;

Divide EACH SIDE of the equation by "(0.075)";

(0.075)x/ (0.075) = (7.38) / (0.075) ;

to get:  x = 98.4 .

The answer is:  98.4 .

  7.5% of 98.4 is 7.38.

b)  The answer is:  312% .

312% of 12.5 is 39 .
 

What percent of 12.5 is 39 ?

(n/100) * 12.5 = 39 ?

n/100 = 39 ÷ 12.5 = 3.12 .

n/100 = 3.12 .

n = 3.12 * 100 = 312.

The answer is:  312% .

312% of 12.5 is 39 .

It is going to be the third choice