Please explain each step from 3 ~ 7 in detail

Abble Inc. packages three types of electronics (Phones, smartwatches, and Computers) in three successive stages. The daily limits on the available times for the three stages are 430, 460, and 420 minutes, respectively, and the profits from their packaging tasks per unit of phone, player and computer are $3, $2, and $5, respectively. The packaging times per product are given in the following table. For example, the packaging times per phone at each of the three stages are 1, 3, and 1 minutes, respectively. A zero time indicates that the stage is not used. Packaging times (minutes) Product Stage 1 Stage 2 Stage 3 Phone 1 3 1 Smartwatch 2 0 4 Computer 1 2 0 1. Formulate an LP model to help Abble Inc. maximize total profit from packaging. 2. What is the optimal solution to this problem? 3. How many minutes are used at each one of the three stages? 4. What are the units of the shadow prices on the capacity constraints? 5. What is the most that Abble Inc. should be willing to pay for additional packaging time at stage 1? stage 2? stage 3? 6. How much should the profit per phone be to achieve a solution in which phones are packaged. 7. Suppose that any additional time for stage 1 beyond its current capacity of 430 minutes per day must be done on an overtime basis at an additional cost of $30 an hour. Workers are willing to work any fraction of time during overtime. Is it economically advantageous to use overtime with stage 1