## Answers

Solution: let initial amount Po rt uring exponential decay model DE I = Po e r=rate of doce decay t = 3 days Perl= 58% Offo = 0.58 P. 0.588 = Poert Ginen = po e 30 37= en (0.58) = r = ln (0.58) 3 In (853)+ Po e 3 Pet I= we have to find t= ? Pet1= 28% of Po= 0.25 Now (Inloosolt 0.25= Po ert 0.25=po è Im (0.58) to Inco.26) 3 ta 3 lm (0.25) In 20.58) = 7.6348 Ausuur: & t = 7.63 days

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