Rafeeq bought a field in the form of a quadrilateral (ABCD)whose sides taken in order are respectively
equal to 192m, 576m,228m, and 480m and has a
diagonal equal to 672m.
a. Find its area to nearest square metre.
b. The cost of 1 meter square land is equal to 200AED, how much did he
spend to buy the field.
c. The cost of fencing 1m is equal to 12.50AED, how much did he spend to fence the field.

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?