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clear
//Given
t=1500
N=0.01
N0=0.999

//Calculation
//
T=t*log(N)/log(0.5)
T1=t*log(N0)/log(0.5)

//Result
printf("\n (i) Years will reduce to 1 centigram is %0.1f  years",T)
printf("\n (ii) Years will lose 1 mg is %0.2f  years",T1)