Answer :

Given, t1/2 = 14.3 days

The disintegration rate, s-1


t = 1 month = 30 days


A˳ = 800 disintegrations/sec


According to Law of Radioactivity, rate of disintegration of a radioactive isotope at time t will decay exponentially with rate of disintegration initially.


So,



disintegrations/sec


Hence, selling rate will be 187 rupees.


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