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First you need to find 7% of 4000 and 4% of 1000 and then add those numbers together. That will tell you how much interest they earned at the end of the year.
Secondly you need to take the amount of money that you got from question one and divide 5000 (4000+1000)from it. Times that number by 100 and you will have your answer for question two.
Does that make sense?
Yes. So that is the answer to question one. Now solve for 320/5000
Now times that by 100
Yes. 6.4% is the answer to question 2. Very nicely done :)