Question 123325: A boy saved $10 in January. Supposed he saved twice as much the previous month, how much will he save at the end of the year? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! JAN $10
FEB $10 + 2*$10 = $30
MAR $30 + 2*$20 = $70
APR $70 + 2*$40 = $150
MAY $150 + 2*$80 = $310
I can keep going with this, or I can try to put it
into a general equation which will give me the savings
after any month
Let savings after month =
where m = 1st month, 2nd month, etc and is the
total savings at the end of that month
check:
OK
