Book Maths Puzzle Percentage

A company has $173,924 in bonds and from them earns $13,824 in simple interest annually. Part of the money is invested at 6.75% and the remainder at 8.24%. How much is invested at each rate?

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Book Other Question

We're trying to solve the following linear function:
The price P of a soft drink is a linear function of the volune v of the cup. A 10-ounce drink sells for 50 cents and a 16-ounce drink sells for 68 cents. Write P as a linear function of v. What should the price be for a 20-ounce drink. Can you PLEASE help me solve this problem - I am at a complete loss.

Thanks!
Beth smith
How do you simplify 3square root 18 - square root 50 +2 square root 72?