1. The first unit of a product took 500 hours to build, and the learning rate for the production process is 72%. How long will it take to make the 128th unit? (Use at least five decimals in the exponent if you use the logarithmic approaches.)
a. from 55 to 63 hours
b. from 63 to 71 hours
c. from 31 to 39 hours
d. from 39 to 47 hours
e. from 47 to 55 hours
2. The first unit of a product took 200 minutes to build, and the learning rate for the production process is 84%. How long will it take to make the 25th unit? (Use at least five decimals in the exponent while using either of the logarithmic approaches.) Select one:
a. from 82 to 86 minutes
b. from 90 to 94 minutes
c. from 86 to 90 minutes
d. from 78 to 82 minutes
e. from 74 to 78 minutes