please provide explanation.

Fund XYZ has unit values (prices) of 1.000 on January 1, 2016, 1.040 on July 1, 2016, and 1.025 on December 31, 2016. A fund manager receives contributions of 100,000 on January 1, 2016 and 100,000 on July 1, 2016 and immediately uses the entire contributions to purchase units in Fund XYZ. Find the dollar-weighted rate of return for 2016. (A) 0.5% (B) 0.7% (C) 1.2% (D) 1.7% (E) 2.5%