SOLUTION: Mary saves $20 the first week. She saves an additional 10% each week. How much will she save on the seventh week?
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Question 544013: Mary saves $20 the first week. She saves an additional 10% each week. How much will she save on the seventh week?
Answer by jpg7n16(66) (Show Source): You can put this solution on YOUR website!
Well since we're trying to find how much she saves each week, let's look to see what pattern forms:
Have you spotted the pattern yet? It's always where the exponent is always the # of the week, minus 1. (Week2 was )
.
So use the following formula:
"A" = amount saved
"p" = initial amount
"n" = number of weeks
.
So for instance, week 1:
.
Or week 4:
.
Both of which we know to be true from our examples above. But now you know how to calculate week 7, 17, or 700 (if needed). Hope this helps!
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