$18$

The $12,000$ units sold and produced increases to $12,500$ units and fixed costs increase by $$5,900.$

$192.$ Unit selling price decreases by $5\%$ and units sold and produced

$20$ increase by $7\%.$ Hint: A unit increase has both a sales and costs impact.

$213.$ Fixed costs increase by $$20,900,$ variable costs per unit decrease by $$2,$

$22$ and units sold and produced increase by $600.$

$23$