exam Maths Puzzle Numerical Ability

A man invested $2500, part at 4%. His total annual income was $110. How much did he invest at each rate?

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I would really appreciate it if someone would please help me with this problem. Solve A=P+ PRT FOR A, given that P=$300,r=7%, and t=4 years. Can someone help me on this?

I need to subtract:

7/9 - 1/6

Thanks,
Ashley