Which calculation does NOT correctly increase 140 by 15%?
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Adding 15 directly gives 155, but 15 is a rate and not the increase amount. The actual increase is 0.15 x 140 = 21, so both 140 x 1.15 and 140 + 21 give 161.
Adding 15 directly gives 155, but 15 is a rate and not the increase amount. The actual increase is 0.15 x 140 = 21, so both 140 x 1.15 and 140 + 21 give 161.