410
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250 - 225 / 250 *100 = 250 - 0.9*100 = 250 - 90 = 160 The answer is exact so percent error is zero.
250
160
0.160 = 160/1000 = 4/250.160 = 160/1000 = 4/250.160 = 160/1000 = 4/250.160 = 160/1000 = 4/25
10% of 160 is 16. 40% of 160 is 64 (4 x 16).