Calculate the standard deviation of the portfolio described

Question

Calculate the standard deviation of the portfolio described in the table below. Assume that the correlation between the two assets is 25%

Assets             Present Value      Relative Weight       Expected return           Standard Deviation

A                       800                          55%                          4%                              35%

B                      650                           45%                          9%                              47%

1. 18.7%     2. 43.3%    3. 10.2%      4. 32%