The rainfall in Paris last year was 86cm a 12 decrease from

The rainfall in Paris last year was 86cm, a 12% decrease from the year before last. What was the rainfall in that year?

Solution

In Year before last, rainfall was 100%

In last year it is 86cm which is 12% less from year before last.

So, last year it is 100-12=88%

86 cm is 88%

then x cm is 100%

86/x=88/100

x=(86*100)/88

x=97.72