Question 28797
total interest = (9% * x) + (10% * (250 + x))
.09x + .1(250 + x) = 101
.09x + 25 + .1x = 101
.19x = 76
x = 400
250 + x = 650
check
.09(400) + .1(650) = 101
36 + 65 = 101
101 = 101
checks OK