need help with formulas

10. If you save $100 per month, what annual rate of interest must you earn in order to accumulate $10,000 after years? 11. If you borrow $250,000 for years and your monthly payment is $1000, what rate of interest are you paying? 12. If you bought a bond five years ago for $900 which paid annual interest of $ and sold it today for $950, what was your rate of return? 13. If you want to accumulate $ _after 30 years and your bank pays 2%, how much will you have to deposit monthly? 14. If you borrow $ for 25 years at 6%, what will be your monthly payment? %, how long will it take for an investment today of 15. If you can earn $700 to grow to $5000? 10. If you save $100 per month, what annual rate of interest must you earn in order to accumulate $10,000 after years? 11. If you borrow $250,000 for years and your monthly payment is $1000, what rate of interest are you paying? 12. If you bought a bond five years ago for $900 which paid annual interest of $ and sold it today for $950, what was your rate of return? 13. If you want to accumulate $ _after 30 years and your bank pays 2%, how much will you have to deposit monthly? 14. If you borrow $ for 25 years at 6%, what will be your monthly payment? %, how long will it take for an investment today of 15. If you can earn $700 to grow to $5000