gaokao 2019 Q14

gaokao · China · beijing-science 5 marks Not Maths
Li Ming started his own business and operates a fruit shop online, selling strawberries, Chinese pears, watermelons, and peaches at prices of 60 yuan/box, 65 yuan/box, 80 yuan/box, and 90 yuan/box respectively. To increase sales, Li Ming offers a promotion: when the total price of a purchase reaches 120 yuan, the customer pays $x$ yuan less. After a customer successfully pays online, Li Ming receives 80\% of the payment. (1) When $x = 10$, if a customer purchases 1 box each of strawberries and watermelons, the amount to be paid is $\_\_\_\_$ yuan; (2) In the promotion activity, to ensure that Li Ming receives at least 70\% of the pre-promotion total price for each order, the maximum value of $x$ is $\_\_\_\_$.
$\frac { 121 } { 3 }$
Li Ming started his own business and operates a fruit shop online, selling strawberries, Chinese pears, watermelons, and peaches at prices of 60 yuan/box, 65 yuan/box, 80 yuan/box, and 90 yuan/box respectively. To increase sales, Li Ming offers a promotion: when the total price of a purchase reaches 120 yuan, the customer pays $x$ yuan less. After a customer successfully pays online, Li Ming receives 80\% of the payment.
(1) When $x = 10$, if a customer purchases 1 box each of strawberries and watermelons, the amount to be paid is $\_\_\_\_$ yuan;
(2) In the promotion activity, to ensure that Li Ming receives at least 70\% of the pre-promotion total price for each order, the maximum value of $x$ is $\_\_\_\_$.