Posted by k on Thursday, March 21, 2013 at 1:26pm.
So first 50000000 times .8 which is the opposite of 20% which gives you your first answer of 40 million left over. The equation for the interest after this is 40000000(0.7^30)
M = Pr/(1-(1+r)^-n)
= 40,000,000*(.07/12)/(1-(1+.07/12)^(-12*30))
= 266121
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