Solve the Problem $t$ Units Are Sold $t > 0$ , Is Given By

Multiple Choice

Solve the problem.
-The profit made when $t$ units are sold, $t > 0$ , is given by $P = t ^ { 2 } - 31 t + 228$ . Determine the number of units to be sold in order for $\mathrm { P } = 0$ (the break- even point) .

A) $t = 31$
B) $\mathrm { t } = 19$ or $\mathrm { t } = 12$
C) $t > 19$
D) $t = - 19$ or $t = - 12$