Question 824397: I need detail solution (and explanation what formulas should be used):
A Nintendo DS costs one hundred and twenty British pounds sterling 12000 pennies . I decide today, 17th
April 2013, to put 10 pennies aside. Tomorrow I’ll put 15 pennies, the day after 20 pennies, the day after that 25p and
so on, increasing the amount by 5 pennies every day. At which date will I have enough to buy the
Nintendo?
Answer by richwmiller(17219)   (Show Source):
You can put this solution on YOUR website! 10+15+20+25 ...
a_n = 5 (n+1) (for all terms given)
12000 = 5 (n+1) (for all terms given)
n = 2399 days
Wednesday, April 17, 2013+2399 days
Monday, November 11, 2019
which is the 101 st anniversary of the end of WWI
2147 days from now xmas
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