Answer:
future payment is $77056.92
total interest is paid after 45 year is  $23056.42
Step-by-step explanation:
Given data 
payment (P) = $100
No of installment (n) = 12
rate of interest ( r ) = 1.5 %  i.e. = 0.015
time period (t) = 45 years 
 
to find out 
future payment and interest after 45 year 
solution
we know future payment formula i.e. given below
future payment = payment × 
now put all these value in equation
future payment = $ 100  ×  
  
future payment = $ 77056.92
payment paid in 45 year @ $100 total money is paid is 45 × 12 × $100 i.e. = $54000
total interest = future payment  - money paid 
total interest = $77056.42 - $54000
 total interest = $23056.42