I previously asked these two questions and the answers ended up being wrong. Ple

Question

I previously asked these two questions and the answers ended up being wrong. Please give me the the correct answers to these two questions especially since I already used up my 20 questions and had to pay extra:

My NoBo 0/2 points 1 Previous Answers 1.11.POO9 a) A photovoltaic array of solar cells : 10.0% efficient in gathering solar energy and converting it to electricity. If the average intensity of sunlight on one day is 700 w/m2 what area in m2 should your array have to gather energy at the rate of 110 w? 7832 m2 (b) What is the maximum cost (in dollars) of the array if it must pay for itself in two years of operation averaging 9.00 hours per day? Assume that it earns monay at the rate of 4.00c per kilowatt-hour. s 31.33

Explanation / Answer

(A) for 110 W eenrgy.

solar energy have to be collected = 110/0.10 = 1100 W  

and P = I A

1100 = 700 A

A = 1.57 m^2

(B) energy used per day = 110 W x 9 h = 990 Wh = 0.990 kWh

Energy used in 2 years = 0.990 x 2 x 365 = 722.7 KWh

cost = 722.7 x 4 = 2890 cents

= 28.9 dollars

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