SAT Math question help!

If I round up, I would have written 64 r.

Let x be the original charge before the 4% tax

x+(0.04)x= 9.88

(1.04)x= 9.88

x= 9.5 , so 9.5 was the original price before the implemented tax

and when you divide the 602 rupees by the original price in dollars to get the exchange rate 602/9.5 
you'll get 63.3, rounding it to next whole number makes it 63.


I hope I helped you ♥