4. Assume a bank wants to limit its losses in a particular sector to 5% of its capital and that the loss rate for this sector is 50%. The concentration limit for this particular borrower is closest to:
　　A.      8.33%
　　B.       2.50%
　　C.       10.00%
　　D.      25.00%
　　4. Correct answer: C
　　5%/50%=10%
　　5. Correct answer: B
　　Cubic SPLINE estimation would make little sense here.