If every six month you receive $$1200$ on $15$ bonds investment with a total maturity value of $$15000,$ what was the annual coupon rate on these bonds?

A$)8\mathrm{.}00\%$

B$)10\mathrm{.}00\%.$

C$)12\mathrm{.}00\%.$

D$)16\mathrm{.}00\%.$