Henry Devine bought a new dishwasher for $320. He paid $20 down and made 10 monthly payments of $34. What actual yearly interest rate did Henry pay? 

    A. 68.75 B. 14.55 C. 34.38
D. 29.09

The answer is B?

   Lily Quinn makes $12.50 and hour. She works four hours on Monday, six hours on Tuesday, nine hours on Wednesday, three hours on Thursday, and seven hours on Friday. What is her gross pay? 

    A. $462.50 B. $325.50 C. $362.50 D. $420.50

The answer is C?

Both look good to me, but not sure about #1.

#1.

present value of loan = 320-20=300
payment = 34
n = 10
let the monthly rate be i

34( 1 - (1+i)^-10)/i = 300

There is no simple algebraic method to solve this type of equation.
One method is interpolation, or if you know calculus, you could use Newton's Method.
I will run it through Wolfram and see what they say:
http://www.wolframalpha.com/input/?i=solve+34%28+1+-+%281%2Bx%29%5E-10%29%2Fx+%3D+300
and using the only logical possible answer of
i = .0234293
we have a monthly rate of .0234
or an annual rate of (.0234..)
(12)
which is appr 28.1% per annum compounded monthly

The closest of your choices is D

check:
34(1 - 1.0234^-10)/.0234 = 300.00455 , not bad

To find the actual yearly interest rate paid by Henry, we need to calculate the total amount of money he paid for the dishwasher, including the down payment and monthly payments, and then calculate the interest rate.

The down payment is $20, and he made 10 monthly payments of $34, which totals to $340 ($34 * 10). Adding the down payment, the total amount paid by Henry is $20 + $340 = $360.

Now, to find the interest rate, we need to calculate the interest he paid. The interest is the difference between the total amount paid ($360) and the original cost of the dishwasher ($320). Therefore, the interest paid is $360 - $320 = $40.

To find the interest rate, we can divide the interest paid by the original cost of the dishwasher and then multiply by 100 to get the percentage. So, ($40 / $320) * 100 = 12.5%.

Therefore, the actual yearly interest rate paid by Henry is 12.5%.

However, none of the provided answer choices match the calculated interest rate of 12.5%, so there might be a mistake in the given answer choices.