An investment of Rs.16000 at 8% Simple Interest for 1 year and a second investment at 18% Simple Interest for the same period together fetch a return of 10% on the total investment. Find the total sum invested.

Correct option is A

Using Allegation method:
8% 18%
10%
8 : 2
Ratio of money invested by 8% to 18% = 8:2=4:1
4+1 = 5 unit
4 unit =16000
1 unit = 4000
=> 5 unit = 20,000
Total sum is 20,000