Answer:
€ 231.88
Explanation:
The total amount Tu's family paid for the 10 nights without the coupon = 200 × 10 = € 2000
With a Tu's mum's coupon of 6.5 % off the total room charges, the amount off = 6.5/100 × 2000 = € 130
The total amount Tu's family paid for the 10 nights with the coupon = € 2000 - € 130 = € 1870
The total room tax = 12.4 % × € 1870 = € 231.88