Vanessa invested $300 in an account for 10 years at 4% simple interest. What is the principal amount?

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Need same math paper but the back now i hope your able to read it cleary i need with hw