The question also says that the lease payments are made at the start of each year, so there is one payment at time 0 and then 7 more payments from time 1 to 7.
If each payment is $X, then the payment at time 0 has a PV of X. The payments from 1 – 7 have a PV of 4.868X. So the total PV is X + 4.868X = 5.868X = 52,000.