A well has just been completed in a newly$-$discovered black$-$oil reservoir. Reservoir pressure appears to be above the bubble$-$point pressure of the oil. Measured at reservoir conditions, $86\mathrm{.}3$ barrels per day enter the wellbore. The oil is processed through a separator into a stock tank. The stock tank accumulates $57\mathrm{.}9$ STBs of $44\mathrm{.}2$ API oil each day. The separator produces $43,150SC\frac{F}{d}$ of $0\mathrm{.}724$ gravity gas, and the stock tank vents $7240SC\frac{F}{d}$ of $1\mathrm{.}332$ gravity gas.

a$)$ What is the formation volume factor of the oil?

b$)$ What is the solution gas$-$oil ratio?

c$)$ Which of the previous answers applies at the bubble point?