Income Valuation Approach For Analyzing and Offer Price

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Hello All, 

I'm using a recently sold comparable property to analyze an offer price. 

Here's the situation: 

These are both similar duplexes. 

Cap Rates for both properties are 6%. The comparable (recently sold) property has rental income that is $150 more than my target property. 

For the sake of the example we can say that the first property sold for $375,000

Can someone show me how to apply these numbers to determine what discount would make sense on the offer price? 

Thanks!