Suppose the value of whatever it is, is P in the first year and Q in the next.
Then the percentage change is 100*(P - Q)/Q or, equivalently, 100*(P/Q - 1)
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First year: 48000*.8=38400 Next years:38400*.9^2=31104 $31104
(Final-Initial)/(Initial) is the formula for percent change (multiply by 100 to make it a percentage) I think this is what you are looking for.
You say to yourself "Six percent is the same as 0.06 ."0.06 x 700 = 42
If the interest rate yearly is 16.75% then the daily interest rate will be 16.75%. The daily, weekly, monthly, or hourly rate doesn't change from one time frame to the next.
Year 1= X Year 2= 25,000 Growth Year 2 vs. Year 1 : 16.7% Year 1 = 25,000 / 1.167 Year 1 = 21,422 Mind the decimal places. :-)