Question: A manager of a 120-seat Singaporean restaurant is interested in comparing the sales performance of two recent years. In 20X1, the restaurant achieved an average lunch spend per head of $15 and a lunchtime seat turnover of 1.4. Also in this year, its dinner average spend per head was $28 with a dinnertime seat turnover of 1.1. In 20X2 the restaurant was open for 312 days and had a revenue of $2,135,000. 37% of the revenue was earned from lunches (56,160 covers served) and 63% was earned from dinners (44,928 covers sold).