1 answer
(click or scroll down)
b = 4 a + 1600
Ia = 0.01 a
Ib = 0.04 b
Ia + Ib = 370 so 0.01a + 0.04 b = 370 or a + 4 b = 37,000
so
a + 4(4a+1600) = 37,000
solve for a, go back and find b