what is the labour cost of the eighth unit?

https://cbept.accaglobal.com/tr-candidate/exam- ACCA PM Practice paper 1

Q.21
Luxury car seat

The estimated labour time for the first unit is 12 hours but a learning curve of 75% is expected to apply for the first eight units produced. The cost of labour is $15 per hour.

The cost of materials and other variable overheads is expected to total $230 per unit. Chair Co plans on pricing the seat by adding a 50% mark-up to the total variable cost per seat, with the labour cost being based on the incremental time taken to produce the eighth unit.

Above info is given and asking

In relation to the luxury car seat, what is the labour cost of the eighth unit?

I am not sure why sample answer says correct answer $45.65 but I can’t figure this out as I only Get $75.94

Your support will be much appreciated