A man saves 18% of his monthly income. If he saves Rs. 3780 per month, what is his monthly income?
Let Rs. Z his monthly income.
∴ Saving = 18% of Rs. Z
⇒ 3780 = 18 /100 × Z
⇒ 3780 = 9 /50 × Z
⇒ Z = 3780 × 50/9
⇒ Z = 420 × 50
[Because 420 × 9 = 3780]
⇒ Z = 21000
Therefore, his monthly income is Rs 21000/-