could you answer this homework please.

1. In KSA, the Sneaker chocolate cost Sr 8. At an exchange rate of Sr3.75/$. Calculate the dollar cost of Sneaker chocolate in KSA. In U.S it cost \$3.2. Do the PPP holds between two countries. 2. Suppose there holds purchase power parity between the United States and the Australia. Assume that the exchange rate between U.S Dollars and the Australian Dollar (AUD) is 1 AUD/ 0.641 USD. Thus, one Australian Dollar will purchase 0.641 U. S dollars. If 2.30 USD purchases one Big Mac Burger in U.S.A, how much should a Big Mac Burger cost in Australia? 3. Solve the System of equations and determine the value of x and y. 2x+9y=20x+3y=10 4. Suppose we deposit 20000SR into a savings account paying annually simple interest at a rate of 2%, determine the future value of the account over the next five years