Mr. Wang hopes to have a deposit of 100,000 yuan in 15 years.  To do that, he plans to deposit an equal amount at the end of each year at a compound interest rate of 7 per cent, with the first deposit at the end of the year (let's say it's the beginning of the year). 

(1) How much money does Mr. Wang need to deposit every year in order to achieve the set goal?

 (2) If Mr. Wang wants to achieve his savings goal of 100,000 yuan in 15 years (assuming the annual interest rate is still 7%) by making a lump sum deposit at the end of this year, rather than the same amount each year?

 (3) If at the end of the fifth year, Mr. Wang can get an additional 20,000 yuan in cash and deposit it in the bank (the annual interest rate is still 7%) to help achieve the initial deposit target.  Then how much should Mr. Wang deposit in the same amount every year?