please answer these questions in the picture given below need these urgent.

nts - GocX Unit 4 Problemsn.pdf 'roblemsn.pdf x Unit 4 Problems (4, 7, 10, 18, and 20) - DO NOT DO 4. Calculating Interest Rates (L03) Solve for the unknown interest rate in each of the following: Pnmt S240 34000 38261 htenst R 4 18 25 l.o 185,382 531.618 Click here for a description of Table. Questions and Problems. 4. 7. Calculating the Number of Periods (L04) At 6.5 percent interest, how long does it take to double your money? To quadruple it? 10. Calculating Present Values (L02) Normandin Inc. has an unfunded pension liability of S575 million that must be paid in 20 years. To assess the value of the firm's stock financial analysts want to discount this liability back to the present. If the relevant discount rate is 68 percent, what is the present value of this liability? 18. Calculating Future Values (LOI) You have Just made your first S5,000 contribution to your RRSP Assumjng you earn an 11 percent rate of return and make no additional contributions, what wilt your account be worth when you retire in 45 years? What 'If you wait ten years before contributing? (Does this suggest an investment strategy?) 20. Calculating the Number of Periods (L04) You expect to recetve SIO 000 at graduation In two years. You plan on investing at 11 percent until you have $75 000 How *ong Wii! you wait from now?