Nweresh orders packs of buttons as follows:
50 economy packs at £1.50 each
30 standard packs at £2.20 each
12 premium packs at £2.56 each
(a) Calculate the total cost of the order.
(b) Giving your answer correct to the nearest penny, calculate the average cost of one pack of buttons.
A cash discount of 12% is offered for prompt payment.
(c) Calculate the payment made after deduction of the cash discount.