A person invests some money in two parts in the ratio 13 : 11. The rate of interest on 1st investment is 17% and the rate of interest on total investment is 22.5%. If simple interest received on 2nd investment is Rs.7975, then find his total investment (in Rs.).

60000

 P (total investment) = P₁ + P₂

P₂ x 29% = 7975 (Given)

P₂ = 27500

Now,

P₁     :     P₂    =  P

13     :     11   =  24

P₂ = 11a = 27500

⇒ a = 2500

P = 24a = 24 x 2500  = 60,000