A busy bank provides customer services through three main steps: Customer Check$-$in$,$ Transaction Processing, and Account Management. Each step requires different amounts of time and resources.

Step $1$: Customer Check$-$in

Time per Customer: $3$ minutes

$5\%$ rework

Number of Service Representatives for Check$-$in: $3$

Efficiency Factor $($due to waiting and administrative tasks$)$: $85\%$

Step $2$: Transaction Processing

Time per Transaction: $5$ minutes

$10\%$ rework

Number of Transaction Tellers: $4$

Efficiency Factor: $90\%$

Step $3$: Account Management

Time per Customer: $10$ minutes

$2\%$ rework

Number of Account Managers: $4$

Efficiency Factor: $80\%$