equity bank ltd has stopped outsourcing the production of subscriber identity module cards. producing the first units requires 240 minutes. the production workers exhibits a learning improvement of 15%.

1. determine the time taken to make the 1st 64 units in double points
2. determine the time taken to make the last 15 units if the total units required are 50 units
3. calculate the time taken to make units; 18th to 35th
4. average time to produce units; 18th to 35th