Today is john 20th he wants to save for retirement. Given the economy he plans to work till his 70th birthday effective annual rate is 10%

He wants to make a signal deposit of 10000 today and withdraw lump sun on his 70th birthday. Alternatively he can make a larger signal depostie on his 30th birthday and get the same lunp-sun amount on his 70th birthday. How much will be required amount deposited on his 30th birthday