SOLUTION: Tom saves $15 in the first week and increases his savings by $6 a week until the week he saves $99. After that week he continues to save $99 each week. Find the amount that Tom ha

Algebra ->  Formulas -> SOLUTION: Tom saves $15 in the first week and increases his savings by $6 a week until the week he saves $99. After that week he continues to save $99 each week. Find the amount that Tom ha      Log On


   



Question 1024541: Tom saves $15 in the first week and increases his savings by $6 a week until the week he saves $99. After that week he continues to save $99 each week. Find the amount that Tom has saved after 20 weeks.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
His savings up to week +n+ when
he has saved $99 are:
+15+%2B+6n+=+99+
+6n+=+84+
+n+=+14+
Add +1+ for the 1st week, so
15 weeks have passed
-------------------
+20+-+15+=+5+ weeks are left
+99%2A5+=+495+
+495+%2B+99+=+594+
After 20 weeks, Tom has saved $594
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