He orders 100 patches and they cost $1.25 each so the patches are 100*1.25 = $<<100*1.25=125.00>>125.00
He sells each of the 100 patches for $12.00 each so he makes 100*12 = $<<100*12=1200.00>>1,200.00
He makes $1,200.00 selling patches and spends $125.00 to have them made so his net profit is 1200-125 = $<<1200-125=1075.00>>1,075.00
#### 1075