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stamp question

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by ns88 » Mon May 07, 2007 10:11 am
The price of postage stamps has increased 5 cents per year
every year since 1990. If 10 stamps were purchased every
year from 1998 to 2002, the total cost would be $35. How
much did a stamp cost in 1995?

A. 45 cents
B. 35 cents
C. 40 cents
D. 48 cents
E. 52 cents


OA coming after some solutions
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by Tame the CAT » Mon May 07, 2007 6:55 pm
The cost from increases by 5 cents per year so the setup is pretty easy

10x+10(x+5)+10(x+10)+10(x+15)+10(x+20) = 3500

50x+500 = 3500

x=60 <---- cost in 1998

so A must be the answer.
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by Cybermusings » Tue May 08, 2007 2:19 am
Answer should be 45 cents
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by f2001290 » Tue May 08, 2007 6:33 am
45 cents
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by ns88 » Tue May 08, 2007 10:41 am
OA is A, 45 cents.
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