Determine a) whether the earlier or later payment has the greater economic value at the given interest rate and b) the interest rate at which the two payments would be equivalent:

Economic Value

The worth of a good or service determined by its ability to satisfy needs or wants; measured by the maximum amount a consumer is willing to pay.

Interest Rate

The proportion of a total amount of money that is required as payment for borrowing it, usually described as a yearly percentage rate.

Equivalent

Something that is equal in value, function, amount, or meaning to something else.