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Inverse function

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pc6817
 
Reply Wed 7 Sep, 2005 10:14 pm
Let m= f(A) be the minimum annual gross income, in thousands of dollars, needed to obtain a 30- year home mortgage loan of A thousand dollars at an interest rate of 9%. What do the following quantities represent in terms of the income needed for a loan?
(a) f(100), (b) f^(-1) (75)

I have no idea how to do this... Confused
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satt fs
 
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Reply Wed 7 Sep, 2005 10:50 pm
(a) The minimum annual gross income, in thousands of dollars, needed to obtain a 30- year home mortgage loan of 100 thousand dollars at an interest rate of 9%.

(b) The maximal amount (100 thousand dollas) of 30-year home mortage loan at an interest rate of 9% if the annual gross income is 75 thousand dollars.
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