The R students in a class agree to contribute equally to buy their teacher a birthday present that costs y dollars. If t of the students later fail to contribute their share, which of the following represents the additional number of dollars that each of the remaining students must contribute in order to pay for the present?
Choose the correct choice from the following options:  A) y/R  B) y/(R-x)  C) xy/(R-x)  D) ty/(R(R-t))  E) y/(R(R-x))
y/(R-t)- y/R   if we simplify this we get choice ty/(R(R-t)), which is the correct answer.
<result>D</result>
The R students in a class agree to contribute equally to buy their teacher a birthday present that costs y dollars. If t of the students later fail to contribute their share, which of the following represents the additional number of dollars that each of the remaining students must contribute in order to pay for the present?