Abu sells mutual funds for CIBC. On mutual funds sales, CIBC charges a "front$-$end load" or gross commission rate of $5\%.$ Abu is paid on a graduated commission structure. He receives $30\%$ commission on the first $$50000$ worth of mutual funds he sells in a month, $40\%$ commission for the next $$50000$ worth of mutual funds, and $75\%$ commission on all additional sales in the same month. What is Abu's commission for a month in which he sells $$150000$ worth of mutual funds?

Select one:

A$.$ $$2700$

B$.$ $$3625$

C$.$ $$5625$

D$.$ $$2250$

E$.$ $$4500$