The number of shirts that should be sold in order to breakeven is 75.
The profit when 150 shirts are sold is $750.
When there is a breakeven, profit earned is zero.
The equation that can be used to determine the number of shirts to be sold to break even is:
Total selling price = fixed cost + (total variable cost)
$15t = $750 + $5t
Where t is the number of t-shirts sold
$15t - $5t = $750
$10t = $750
t = 75
Profit is the total selling price less cost price
(150 X $15) - $750 - ($5 x 150)
$2,250 - $750 - $750 = $750
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