My 2 cents on this:
I equated as follows:
Total purchase = x
0.05x = 0.08x - 12
x = 400.
Question asks for total purchase cost + sales tax, so 400 + 8% of 400 = 432
I equated as follows:
Total purchase = x
0.05x = 0.08x - 12
x = 400.
Question asks for total purchase cost + sales tax, so 400 + 8% of 400 = 432







