Correct Option is: C
Let actual share of Ali, Ahmad and Waqas be A, D , P respectively.
Hence, Ali, Ahmad and Waqas share are diminished by Rs 5, Rs 10 and Rs 15, their net share will be Rs.4800.
Ahmad diminished share = (4/12) * 4800 = Rs1600
Hence, Ahmad actual share =Rs1600+Rs10= Rs 1610.