First you can calculate that you make $185 a week. Next you want to add up the total percentages that you will be losing which adds up to 27%. Next you want to divide 185 by 100 resulting in 1.85. After that you can multiply 27*1.85 getting 49.95. If you subtract 49.95 from 185 you get 135.05. After this you subtract the 40 you are saving to get 95.05. For the second question you divide 185 by 100 to get 1.85. You multiply this by 15 and get the answer of 27.75.
So overall your answers should be:
3. 95.05
4. 27.75