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Calculate Interest Per Month


Sample data:

02-06-09 to 18-06-09 earned $2500
19-06-09 to 23-08-09 earned $3500
24-08-09 to 31-12-09 earned $4500

I am thinking if there's a formula that can calculate the interest earned for each month from Jun-09 to Dec-09.


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30 year amortization
10 years interest only

normal client would pay an interest only payment of 674.13, then after i/o period would go to 953.80 for last 20 years of the loan, and they'd pay about $178k in interest.. Now if that client pays an extra 1,000 per year, I can calculate the amount of interest they'd accrue, but have no clue how to back into the "effective interest rate", basically that says you are paying the same amount of interest as someone with a x.xx% interest only loan.

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Cell Lock, Interest Calculator Formula
1. Can I lock particular cell If Yes,How? I want to lock cells which contains formulas.

2. If cell K7 shows 11 I want to see G11 in H9. Same if Cell K7 shows 201 I want to see G201 in H9.

Its a interest calculation sheet where K7 is number of days amount invested and COLUMN G shows interest accured.

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