Question 702747
x + y = 4000; therefore, x = 4000 - y
.07x + .015y = 225
...
substitute
.07(4000-y) + .015y = 225
280 - .07y + .015y = 225
-.055y = 225 - 280
-.055y = -55
{{{highlight_green(y = 1000)}}} at 1.5%
x = 4000 - 1000 = {{{highlight_green(x = 3000)}}} at 7%
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