Pixtel Ltd uses a standard costing system. Production occurs evenly during the year. Machine hours (mhr) are used to allocate variable and fixed manufacturing overhead and the manufacturing overhead rate is based on the annual budget. For the 2020 year the company had budgeted manufacturing overhead of $5,160,000 where this was comprised of variable overhead of $1,440,000 and fixed overhead of $3,720,000. For 2020, the company budgeted for 400,000 units to be produced and for 800,000 mhr to be used in producing these units. Additional manufacturing overhead data follows: Manufacturing Budgeted Cost/Mhr Budgeted Cost/Unit April 2020 April 2020 Overhead Actual Overhead Budgeted Overhead Variable Overhead $1.80 $3.60 $130,000 $120,000 'Fixed Overhead $4.65 $9.30 $315,000 $310,000 Actual production for April 2020 was 45,000 units and 112,500 mhr were used in production. Required: a) Calculate the total amount of overhead applied for April 2020. Show all calculations. b). For April 2020, calculate the following variances, showing all calculations: i. Variable overhead spending variance ii. Variable overhead efficiency variance iii. Fixed overhead budget variance iv. Fixed overhead volume variance c). For each of the variances you have calculated in part b) above, interpret your results and provide possible reason(s) why each variance has occurred