If t = 0 in April of this year, then t = 3 in July of this year (since there are three months between April and July). We can substitute this value of t into the equation to find the forecast for July:
Yt = 40,000 + 150t
Y3 = 40,000 + 150(3)
Y3 = 40,000 + 450
Y3 = 40,450
Therefore, the forecast for July is $40,450.