Question 192373
cost =  $22.50*d +$7.50  *x

where  d =  number  of  designs  (1  for  all  problems  today)
and  x =  number  of  shirts

Cost  Sentence,  Total  cost  is  $22.50  for  each  design  plus  $7.50  for  each  shirt purchased

Income =  sales    - cost

I=$8.25* x1 -($22.50d+$7.50*x2)

I= $8.25*x1-$7.50*x2-$22.50d

x1= number  of  shirts sold
x2 = number  of  shirts purchased
where  I  =  Income  or  Profit

Income  Sentence,  Total  income is  equal  to  $8.25  for  each  shirt  sold less $7.50  for  each  shirt purchased  less again  $22.50  for  each  design.