$1.$ A real estate broker charges a commission of $6\%$ on sales

a$)$ Represent the commision earned as a fuction R $(3$ marks$).$

b$)$ Find R $(500,000)$

$2.$ The agent moves to a new department where commission is ow a fixed $$3000$ and $7\%$ of sales.

i$)$ Represent the commission earned as a function Z$.$

ii$)$ Find Z $(900,000$

$3.$ A paint manufacture's total cost of producing paint consist of a fixed overheard of P$400$ plus production cost of P$10$ per unit. Express the total cost sa a fuction of the number of units produced and draw the graph.

$3.$ Shosoloza Firm determines that the cost of producing women's belts is $$4$ each plus $$600$ per day in fixed costs. The company sells the belts for $$3$ each. What is the break $-$even point per day.