math

An investor receives a total of Rs.5,700 per annum in interest from 3 stocks yielding 4%, 5% and 8% per annum respectively. The amount at 4% is Rs.20,000 more than the amount invested at 5%, and the interest from the 8% investment is 8 times the interest from the 5% investment. Amount of money invested in each stock is:

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  1. I'm having trouble setting this one up. The one I'm trying to figure out how to lay out in an equation is

    Roberto invested some money at 7%, and then invested $5000 more than twice this amount at 9%. His total annual income from the two investments was $3700. How much did he invest at 9%?

    I know it would be .07x and .09x, and probably equal to 3700 since it's the output? Should .09 be .09y?

    I'm hip when they give the total amount that was invested for the outcome, but this one's throwing me.

    thank you for your time.

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