Consider a $20-$year$-$old male. Suppose the survival rate is reduced $2\%$ per year. That means survival

rate at age $21$ is $98\%,$ and that at age $22$ is $96\%,$ etc.

a$)$ According to the above assumption, what is his maximum age?

b$)$ Compute the probability that he can celebrate his $60$th birthday.

Using R to slove it