Question 665430
12x = money made
20+8x = cost 
where x is the number of t-shirts made
selling for $12 ea
...
Amount made - cost = profit
12x - (20+8x) = 100
12x - 20 - 8x = 100
4x = 100 + 20
4x = 120
x = 30 shirts 
...
Check
{{{cartoon(
12*30 = 360,
20+(8*30) = 20+240 = 260,
360 - 260 = 100)}}}
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