3. You purchase a broken guitar for $500, which you know you can sell for $1000 after it is E repaired. You thought repairs would cost $300, but now discover the cost will be $700. As a result: a) you should repair the guitar if its resale value is $100 if you do not repair it. b) you should repair the guitar if its resale value is $500 if you do not repair it. 31 you should repair the guitar if its resale value is $700 if you do not repair it. d) you should never repair the guitar. e) you should always repair the guitar