Peter took a loan from a bank whose 1st instalment of 3 dollers if increases the instalment by 10 dollars every month what amout will he pay in the 25th instalment
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Explanation:
First installment = rs.200
Installment increases by rs.5 every month
So, Second Installment = Rs.200+Rs.5 = Rs.205
Third Installment = Rs.205+Rs.5= Rs.210
So, It forms an AP : 200,205,210, .............
So, First term = a = Rs.200
d = common difference = rs.5
Formula of nth term = a_n=a+(n-1)da
n
=a+(n−1)d
Substitute n = 25
a_{25}=200+(25-1)(5)a
25
=200+(25−1)(5)
a_{25}=320a
25
=320
Hence He will pay Rs.320 in 25th installment .
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