Scottie wants to accumulate $$30,000$ for a down payment for a house. He can only afford to set aside $ $300$ at the beginning of every quarter. The account will credit interest monthly at the annual rate of $7\mathrm{.}5\%.$ You wish to know how long it will take Scottie to reach his goal. Find p $($the equivalent rate of Interest per payment period$)$a$\mathrm{.}0\mathrm{.}018577$b$\mathrm{.}0\mathrm{.}018123$c$\mathrm{.}0\mathrm{.}018867$d$\mathrm{.}0\mathrm{.}01875$e$\mathrm{.}0\mathrm{.}018245$