$1.$ An aircraft services company has an order to refurbish the electronics of $18$ planes. The work has a learning percentage of $80$ percent. The first plane has required $300$ hours to refurbish. Estimate the time needed to complete: a$.$The fifth plane. b$.$ The first five planes. c$.$ All $18$ planes. $2.$ A contractor intends to bid on installing $30$ in$-$ground swimming pools. Because this will be a new line of work for the contractor, he believes there will be a learning effect. After reviewing time records from a similar type of activity, the contractor is convinced that an $85$ percent learning curve is appropriate. He estimates that the first pool will take his crew eight days to install. How many days should the contractor schedule for LO$2$ a$.$ The first $10$ pools? b$.$ The second $10$ pools? c$.$ The final $10$ pools? $3.$ Students in an operations management class have been assigned four similar homework problems. One student took $50$ minutes to complete the first problem. Assume that a $70$ percent learning curve is appropriate. How much time can this student plan to spend solving all the remaining problems? LO$2$