A charity solicited P persons over the phone who agreed to an average pledge of Rs.R each. Q of these people who had pledged an average of Rs. S each never sent in the pledged amount. Which of the following expressions represents the percentage of pledged money that the charity received?	Choose the correct choice from the following answers
A) 100*(PR/QS)  B) 100*(QS/PR)  C) 100 (PR - QS)  D) 100(1-QS/PR)  E) 100(PR-QS/PR)
Explanatory Answer   Total amount solicited from P persons, each of whom agreed to pledge Rs.R = Rs.P*R   Of these Q did not send the pledged amount. Average value of amount not sent = Rs.S.   Hence, the total amount pledged but not received = Rs.Q*S   The charity therefore, received Rs.(PR - QS)   Expressing the amount received as a percentage of amount pledge, we get ((PR-QS)/PR)*100   Or, the expression can be rewritten as 100(1-QS/PR)   Answer 100(1-QS/PR)
<result>D</result>
A charity solicited P persons over the phone who agreed to an average pledge of Rs.R each. Q of these people who had pledged an average of Rs. S each never sent in the pledged amount. Which of the following expressions represents the percentage of pledged money that the charity received?