Question 721585
risky venture amount r

interest from it = 0.07r

Balance at 3%

5000-r  @ 3%

Interest = 0.03(5000-r)

total interest = 270

0.07r+0.03(5000-r)=270

0.07r+150-0.03r=270

0.04r= 270-150
0.04r=120
r=120/0.04
r=3000