A retailer is offered a regular discount of $15\%,$ a further discount of $7\%$ if she places an order exceeding $$21,000($at list prices$),$ and another $3\%$ discount for participating in a joint promotion with the distributor. For full marks your answer$($s$)$ should be rounded to the nearest cent.

a$)$ If the retailer is eligible for all three trade discounts, what will be the net price of an order totalling $$25,500?$

Net price $=$$$0\mathrm{.}00$

b$)$ What is the dollar amount of the savinn from the quantity discount $($assuming that she does not participate in the joint promotion$)?$

longrightarrow

c$)$ What is the dollar amount of the discount received for participating in the joint promotion?

Joint promotion discount $=$$$0\mathrm{.}00$