The following is a table of interest rates credited under the investment year method. Unfortunately, a few entries are missing: Investment Year Rates Portfolio Rates Calendar Year of Original Investment y 1992 Y+3 5.2% 4.8% 4.3% 1993 4.2 4.7 4.0 1994 5.5 5.7 5.1 It is known that an investment of $1,000 in 1992 will accumulate to $1,270.15 at the end of five years and that an investment of $1,000 in 1993 will accumulate to $1,247.33 at the end of five years. Calculate i1992 O a. 4.4% O b. 5.6% O c. 4.9% O d. 5.0% O e. 4.6%