A retailer purchases merchandise with a catalog list price of $$34,000.$ The retailer receives a $34\%$ trade discount and has credit terms of $2/10,$ n$/30.$ How much cash will be needed to pay this invoice within the discount period?

a$.$ $$22,440$

b$.$ $$34,000$

c$.$ $$21,991$

d$.$ $$23,120$