Question

If $=90 then 1 indian rupee which be how much ????

Answer 1

1$ = Rs 90

=> Rs 1 = $ 1/90

=> Rs 1 = $ 0.1 / 9

=> Rs 1 = $ 0.011

Answer 2

1 dollar = 90 rupees
so, 1 rupee = 1/90
                   = 0.011 dollars