A and B invested in a business in the ratio 7 : 11, in the annual profit they donated 10% of the profit to a charity, and after donating, A received Rs.12600 as his share in the profit, then what amount is donated to the charity ? Choose the correct choice.
A) Rs.2500
B) Rs.1800
C) Rs.3600
D) Rs.1260
E) Rs.1860
Ratio of investments of A and B = 7 : 11 = [18 units].   A received = Rs.12600.   Total profit = 12600 / 7 × 18 = Rs.324000.   Profit after donation = Rs.32400 which is [Profit – 10% = 90% of the actual profit].   Profit before donation = 32400 / 90 × 100 = Rs.36000.   Actual profit = Rs.360000 =&gt; Donation = Rs.36000 × 10 / 100 = Rs.3600   Option Rs.3600
<result>C</result>
A and B invested in a business in the ratio 7 : 11, in the annual profit they donated 10% of the profit to a charity, and after donating, A received Rs.12600 as his share in the profit, then what amount is donated to the charity ?