Suppose that you arrive at a bus stop randomly, so all arrival times are equally likely. the bus arrives regularly every 70 minutes without delay. what is the expected value of your waiting time

The answer will be y=-5+0 because the slope is -5 and the it has to go through y-axis 0

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho