Waterways is thinking of mass$-$producing one of its special$-$order sprinklers. To do so would increase unit variable costs for all

sprinklers by an average of $$0\mathrm{.}60.$ The company also estimates that this change could increase the overall number of sprinklers

sold by $10\%,$ and the average unit sales price would increase $$0\mathrm{.}20.$ Waterways currently sells $489,000$ sprinkler units at an

average unit selling price of $$28\mathrm{.}20.$ The manufacturing costs are $$8,393,890$ variable and $$1,283,761$ fixed. Selling and

administrative costs are $$2,637,950$ variable and $$800,440$ fixed.

If the average unit sales price per sprinkler did not increase when the company began mass$-$producing the special$-$order sprinkler,

what would be the effect on the company? $($Round ratio answer to $0$ decimal places, e$.$g$.5\%$ and profit answer to $2$ decimal places, e$.$g$.$

$5,275\mathrm{.}25.)$

Contribution margin ratio increase$/$decrease by $\_\_\_\_\_$