A sum of 1600 dollars is deposited in an account with an interest rate ofrpercent per year, compunded daily. At the end of 7 years, the balance in the account is given by

A=1600 (1 +r

36,500

)2555 .

/

dAdr= 112 *(1+r/36,500)^2554

then Ifr= 7, thendA/dr= ??? dollars/(one percentage point).