Every year, Mabel gets as many quarters as she is years old. She always puts these and nothing else in a piggy bank. When she turns 7, how much money is in the bank?
On her second birthday she adds $.5 because 2 x .25 = <<2*.25=.5>>.5
On her third birthday she adds $.35 because 3 x .25 = <<3*.25=.75>>.75
On her fourth birthday she adds $1 because 4 x .25 = <<4*.25=1>>1
On her fifth birthday she adds $1.25 because 5 x .25 = <<5*.25=1.25>>1.25
On her six birthday she adds $1.5 because 6 x .25 = <<6*.25=1.5>>1.5
On her seventh birthday she adds $1.75 because 7 x .25 = <<7*.25=1.75>>1.75
The total is $7 because .25 + .5 + .75 + 1 + 1.25 + 1.5 + 1.75 = <<.25+.5+.75+1+1.25+1.5+1.75=7>>7
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