1. The first unit of a product took 200 minutes to build, and the learning rate for the production process is 82%. How long will it take to make the 20th unit? (Use at least five decimals in the exponent while using either of the logarithmic approaches)

2. The first unit of a product took 80 days for production. The learning rate for the production process is 85%. How long will it take to make the 9th unit? How long for the 14th through 17th? how long for the whole first 13 units?(You can use Table E.3 in Module E(Learning Curves) of the textbook.)