the demand for a certain type of auto tire is given by x=f(p) 50(1+e^-p/60).
a)if the weekly quantity demanded is 60000 tires find the price?
b)if the current price is $120 per tire and is increasing at a rate of $2 per week, what is the rate of change of the demand per week?
please show few steps to get better idea of how it is calculated.