Hello there! So tennis lesons cost $108 every 6 weeks. We can divide both numbers to find the price per week. 108/6 is 18. Emma pays $18 a week on tennis lessons. There are 52 weeks in 1 year, We can multiply weeks by the amount per week to get the total cost per year. 18 * 52 is 936. There. Emma pays $936 per year on tennis lessons.