350x = 350*400 = 140000
so 350x - 70 = 139930
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400 x 28 = 11200
100 x 400 is equal to 40,000
2 x 2 x 2 x 2 x 5 x 5 = 400
400 x 80 = 4 x 100 x 8 x 10 = 4 x 8 x 1000 = 32000
Simple interest 400 + (4 x 5 x 8) = 400 + 160 = 560; Compound interest 400 x 1.085 = 400 x 1.47* = 588. *Actually the multiplier is 1 .469