Solve the Problem $P$ Of a Certain Computer System Decreases Immediately After Its Introduction

Multiple Choice

Solve the problem.
-The price $P$ of a certain computer system decreases immediately after its introduction and then increases. If the price $P$ is estimated by the formula $P=150 t^{2}-2000 t+6600$ , where $t$ is the time in months from its introduction, find the time until the minimum price is reached. Round to the nearest tenth if necessary.

A) 6.7 months
B) 26.7 months
C) 13.3 months
D) 10 months