Exponential growth word problem 

A coin sold for ​$\$ 269$ in 1980 and was sold again in 1989 for $\$ 477$. Assume that the growth in the value $V$ of the​ collector's item was exponential. ​

a) Find the value k of the exponential growth rate. Assume $V_0$ equals=269.
b) Find the exponential growth function in terms of​ t, where t is the number of years since 1980. ​
c) Estimate the value of the coin in 2013. ​
d) What is the doubling time for the value of the coin to the nearest tenth of a​ year?
​e) Find the amount of time after which the value of the coin will be $ \$ 2878$.


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Erdos Erdos
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