Standard costing

Brake LTD manufactures and distributes brake discs to the automotive sector. The company operates an integrated standard cost system in which:

-Purchase of materials are recorded at standard costs
-Direct material costs and direct labour costs are variable
-Production overheads are fixed and absorbed using direct labour hours

Actual and budgeted data for May are shown below:
-Budgeted direct materials per unit- 2kg at 5$ per kg
-Direct Labour- 0.5hours per unit
-Budgeted production for the month was 10,000
-22,500kgs of material were purchased
-The total standard cost of the material was 115,000$
-6,000 direct labour hours were worked of 6$ per hour
-Budgeted Fixed production overheads in the period were 240,000$
-Actual fixed production overheads in the period were 260,000$

Variances calculated for May are as follows:
-Material price variance 11,250$ A
-Labour efficiency variance 1,750$ A

1- Calculate the actual number of brake discs manufactured (11,500) ?????
2- Calculate the actual price paid per kg of material (5.50)
3- Calculate the material usage variance (2,500 Favorable)

I answered questions 2, 3 but I don’t get how they got this figure in the first question.

Thanks in advance