Answer
(a) $\approx\$130$
(b) $\approx\$275$ more
Work Step by Step
(a) Since the point (11, 6000) appears to be midway between the contours
labeled 120 and 140, we estimate the monthly payment to be $\$130$.
(b) Since the monthly payment of $\$130$ remains the same and the interest rate decreased to $9\%$, on the counter plot, the amount that can be borrowed in addition to the $\$6000$ is $\$275$ or more
