The answer is option "b, P(t)= -90t^2+1,205t+1,375".
Profit from the bakery = B(t)=-50t^2+650t+700
Profit from the juice bar = Juice Bar: J(t)=-40t^2+555t+675
Total profit P(t) = B(t) + J(t)
P(t) = (-50t^2+650t+700) + (-40t^2+555t+675)
=-50t^2+650t+700 -40t^2+555t+675
= -90t^2+1,205t+1,375