Question

if 10% is deducted from a bill. $58.50 remains to be paid. how much is the bill

Answer 1

90%=58.5
100%=x=58.5/90*100
x=585/9=65
therefore the actual bill amount is $65

Answer 2

discount = d= 10%
original bill = M
 bill paid = $58.50

M = (bill paid * 100)/(100-d)

= (58.50 *100) /(100-10)
= 5850/90
= 65
original bill =M = $65