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clc
// given data
g=0.2 // annual gas price increase rate
i=10/100.0 // discount rate
n=15 // time in years
A1=350*8 // payment at end of 1st year in lakhs rs
Pgg=(A1/(i-g))*(1-((1+g)/(1+i))**n) // present worth in Rs
printf("The present worth of saving is Rs %.0f",Pgg)
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