The demand for subassembly S is 90 units in week 7. Each unit of S requires 2 unit of T and 2 units of U. Each unit of T requires 2 unit of V, 1 units of W, and 1 unit of X. Finally, each unit of U requires 1 units of Y and 3 units of Z. ONe firm manufactures all items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to make U, 1 weeks to make V, 3 weeks to make W, 2 week to make X, 2 weeks to make Y, and 2 week to make Z. In addition to 90 units of S, there is also demand for 30 units of U, which is a component of S. The 30 units of U are needed for maintenance purposes. These units are needed in week 6. Modify the gross material requirement plan to reflect this change.
a) Using the infomation construct a gross material requirements plan.
b) Construct a net material requirements plan of the on-hand inventory.

Areal estate agent is considering changing her cell phone plan. there are three plans to choose from, all of which involve a monthly service charge of $20. plan a has a cost of $.42 a minute for daytime calls and $.17 a minute for evening calls. plan b has a charge of $.52 a minute for daytime calls and $.15 a minute for evening calls. plan c has a flat rate of $80 with 275 minutes of calls allowed per month and a charge of $.38 per minute beyond that, day or evening.a. determine the total charge under each plan for this case: 150 minutes of day calls and 70 minutes of evening calls in a month. (do not round intermediate calculations. round your answer to 2 decimal places. omit the "$" sign in your response.)c. if the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal? (round each answer to the nearest whole number.include the indifference point itself in each answer.)d. suppose that the agent expects both daytime and evening calls. at what point (i.e., percentage of total call minutes used for daytime calls) would she be indifferent between plans a and b?