Question

The cost of mailing a letter went up 1133% over the fifty-year period 1938-1988. If it cost 43c to mail a letter to a Canadian address in 1988, what (to the nearest penny) did it cost in 1938?

Answer 1

In 1938 it cost 3.49¢

Step-by-step explanation:

The cost of mailing a letter went up 1133% over fifty year period from 1938 to 1988.

Cost to mail a letter to a Canadian address in 1988 = 43¢

Let it cost in 1938 be 'a'

a +(1133% of a) = 43¢

$a+(\frac{1133}{100}\times a)=43$

$a+(11.33a)=43$

12.33a = 43

$a=\frac{43}{12.33}$

a = 3.487429 ≈ 3.49¢

In 1938 the cost of mailing 3.49¢

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