Last month, Brand Products manufactured 25,000 calculators and sold 23,000 of these calculators at a price of $10.00 each. Manufacturing costs consisted of direct labor, $30,000; direct materials, $32,000; variable manufacturing overhead, $3,500; fixed manufacturing overhead, $21,500. Selling and administrative costs are all fixed and totaled $24,000. Beginning inventory consists of no units. Brand Products uses full costing. How much will the company's gross margin increase if sales increase 10%?

Less than 10%

More than 10%

10%

It depends on other factors not given.