Modeling Costs for the General Store Solution my last name is paliwal so my fixed cost would be 7800$ to 8500$ i choose c to be 8000$ W=-.01x 2 +100x+ 8000 let x be 100 w= -100+ 10000+ 8000 = 17900 let x be 200 w= -400+20000+8000 = 27600 so the cost is increasing as i m increasing the value of x means the variable cost is increasing .