Netflix Inc. offers three subscription plans: Basic, Standard, and Premium. The monthly subscription fees and variable costs per subscriber for each plan are as follows:

Subscription Plan	Monthly Fee ($)	Variable Cost per Subscriber ($)
Basic	$10	$4
Standard	$15	$6
Premium	$20	$8

If the sales mix is 40% Basic, 30% Standard, and 30% Premium, calculate the weighted average monthly fee and contribution margin per subscriber.