A deposit of $ 1,000 is made into an investment fund at time 0. After 3 months, $ 300 is injected into the fund. After 8 months, $ 200 is withdrawn from the fund. No other deposits or withdrawals are made. The fund balance after 1 year is $ 1,000. 

(a) Find the internal rate of return. 

(b) Find the effective capital of the fund over the 1-year period. 

(c) Compute the DWRR of the fund.