Answer:
We can borrow an additional 6,250 dollars
Explanation:
credit card rate:
old one: 0.15 / 12 = 0.0125 percent per month
new one: 0.12 / 12 = 0.01
interest forthe old car:
25,000 x 0.0125 = 312,5
now we convert this payment in a perpetuity with a rate of 0.01
312,5 / 0.01 = 31.250
maximun balance 31,250 current balance 25,000
available for loan 6,250 (31,250 - 25,000)