Actual fixed production OH

The 20YY results for Weather Factory are as follows: The sales budget for 20YY was set at 4,800 units selling at $35 each. The standard absorption cost per football was $21, and the standard contribution per football was $18. The actual results for 20YY were as follows: 5,100 footballs were sold for $168,300, and non-production overheads were $34,500. The variances calculated were as follows: Sales volume variance 4,200 (Favourable) Sales volume contribution variance 5,400 (Favourable) Sales price variance 10,200 (Adverse) Materials price variance 1,575 (Favourable) Materials price variance 450 (Adverse) Labour rate variance 10,400 (Favourable) Labour efficiency variance 1,200 (Adverse) Variable production overhead expenditure variance 2,080 (Adverse) Variable production overhead efficiency variance 200 (Adverse) Fixed production overhead expenditure variance 560 (Adverse) Fixed production overhead volume variance 1,200 (Favourable) Hello tutor, in this question, they calculated Actual fixed production overheads of $ 19,760 I tried to figure out the way to come to this result, but could not make it. Can you please explain how we can come to that result? Thank you!