An online company charges for shipping based on the cost of the order. For orders costing up to
$25 you'll pay $3.50. If your order total is more
than $25 and up to $75 shipping is $5.95. Any
order totaling more than $75 but up to $125.00,
shipping will be $7.95. If your order exceeds
-$125, you will pay $9.95 for shipping.

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?

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Skie rented a boat for $16.50 per hour. her total rental fee was $49.50. for how many hours did skie rent the boat