gold coast Co$.$had a break$-$even point of $$500,000$ in $2020,$ based on a selling price of $$10$ per unit and fixed costs of $$250,000$ in $2021,$ the break$-$even point increased to $$800,000$ but the selling price and variable costs per unit did not change.

Instructions:

a$.$ Compute the contribution margin per unit for $2020.$

b$.$ Compute the contribution margin ratio for $2020.$

c$.$ Compute the increase in fixed costs for $2020.$