"A=16250-16250\\times0.075+311=15342.25"
B=927+1156=2083
pay month class A:
"P=S(i+\\frac{i}{(1+i)^n-1})"
"P=15342.25(0.02+\\frac{0.02}{(1+0.02)^{12}-1})=1450.76"
paying of class B;
S=2083
P=150
"n=\\frac{log\\frac{S}{P}}{log(1+i)}"
"n=\\frac{log\\frac{2083}{165}}{log(1+0.18)}=\\frac{log12.624242}{log1.18}=\\frac{1.101}{ 0.07188}=15.3"
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