The number of cars at a dealership dropped from 64 to 48 after a weekend sale. What is the percent of decrease in the number of cars? Please answer! Please! If possible, explain too.

Please answer as soon as possible! I will mark brainliest! (if it works)
Round to the nearest percent, if necessary.

20%
25%
30%
75%

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?