materials purchases budget & total cost

Dear Mr John. Q1) Finished product : Sales 7000 units, production units 7200 units Materials: usage per unit 3kg opening stock 400kg, closing stock 500kg materials purchase budget for the months ? my answer :21700kg ??? Q2) A company operates a job costing system. job number #007 required $45 of direct materials and $30 of direct labour. Direct labour is paid at the rate $7.50/hrs. production overhead are absorbed at the rate of $12.50 per direct labour hrs and non-production overhead are absorbed at rate of 60% of prime cost. The total cost of job #007 is $170 ?? Q3)Salary cost /hrs for senior $40 Salary cost /hrs for junior $25 Overhead absorption rate per hour applied to all hours $20 Organisation adds 40% to total cost to arrive at the final fee to charged client. Assignment 'Project Runway' took 54hrs of a senior time and 110 hours of junior time. What is the final fee to charged for 'project runway' My answer is : $11466.? Thanks