please explain

We need a senior programmer to complete four work assignments, each involving similar but different coding activities, Assume that the senior programmer's learning rate for coding is found to be 90%. The steady state time to code the sequence is 40 hours (i.e., for the 4th code). Estimate the time that programmer needs for the first coding iteration. Then calculate the cost of the project if the programmer pay rate is $37.50 per hour, and his/her overhead-charge factor and personal time factor are, respectively, 1.65 and 1.12