Please help with questions 2-4

please help with questions 2-4 using financial calculator steps or formula

2. Suppose an investment offers to triple your money in 12 months (don't believe it). What rate of return per quarter are you being offered? 3. You have just purchased a new house. To finance the purchase, you've arranged for a 30year mortgage loan for 75 percent of the $400,000 purchase price. The monthly payment on this loan will be $1,500. What is the APR on this loan? EAR? 4. You want to buy a new sports car from Muscle Motors for $128,000. The contract is in the form of a 60-month annuity due at a 4.25 percent APR. What will your monthly payment be