Answer:-
If 100 envelopes cost 70 cents, then each envelope costs 0.7 cents. To find the cost of 250 envelopes, multiply the cost per envelope by 250. So, 0.7 cents × 250 = 175 cents. Since 100 cents make a dollar, 175 cents equals $1.75. Therefore, 250 envelopes would cost $1.75. This is a simple example of using unit rates to scale up a cost, and it helps show how basic multiplication and conversions between cents and dollars can solve everyday math problems quickly and accurately.
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