Suppose an Exhaustible Resource Can Be Sold Only This Period

Suppose an exhaustible resource can be sold only this period or in the next period.The marginal cost of extraction is constant and equal to $5.The current year price of the resource is $55,respectively.The interest rate is 10%.What is the minimum next year price required to make the sale of the resource profitable next year?

A) $55
B) $60
C) $65
D) $75