Problem: Calculate the convexity of the ABC bond
Company    Maturity (years)    Coupon (%)    Price    Yiled to Maturity (%)
ABC      4    10    98      10.63
DEG      8     9     87      11.53
GHI     22    11    102    10.76
JKL      28    10    90      11.17
Suppose market interest rates change by 50 basis points. Estimate the new price of the ABC bond using the follosing:
a. Duration only
b. Duration and convexity