Neco 2021 Government Question 7

In a mixed‑member proportional electoral system a parliament consists of 70 constituency seats and 30 list seats (total 100 seats). The election results are: Party X won 40 constituency seats and received 30 % of the national vote; Party Y won 20 constituency seats and received 45 % of the vote; Party Z won 10 constituency seats and received 25 % of the vote. List seats are allocated to bring each party's total seats as close as possible to its proportional share of the 100‑seat parliament. If a party already has more constituency seats than its proportional entitlement, the excess becomes over‑hang seats and the size of parliament increases accordingly. How many total seats will Party X occupy in the final parliament?