# Thread: Derivative (Chain Rule/Interest rate)

1. ## Derivative (Chain Rule/Interest rate)

Can anyone help me providing the answers for exercise 1 and 2?
I've tried to solve it, but didn't go far. Thank you so much in advance! :-)

2. $\frac{dA}{dr}=1700*1095(1+\frac{r}{36500})^{1094}* \frac{1}{36500}$

$\frac{dA}{dr}=51(1+\frac{r}{36500})^{1094}$

If r=7, then

$\frac{dA}{dr}=51(1+\frac{7}{36500})^{1094}$

$\frac{dA}{dr}=62.9$