1. You are investing $10,000 for 30 months at simple interest. At the end, you receive a total of $10,925. Calculate the simple interest rate as a percentage. 2.Calculate how much you need to invest today at 3.5% simple interest rate to have $12,000 in 4 years. 3. After a discount of 35%, you pay $169 for an item. Calculate the initial price of the item. 4. What is the total cost of buying a $470 ipad that is on sale at 15% off if the local sales tax rate is 6%