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pav-90 [236]
3 years ago
9

A store is instructed by corporate to put the markup of 43% on all items. An item costing 7$ is displayed by the manager at sell

ing price of 3$ . Notice that the selling price is wrong . Find the correct selling price . What is the managers error?
Mathematics
1 answer:
Shalnov [3]3 years ago
5 0

Answer:

Selling rice is $10.00

Step-by-step explanation:

The manager put what the markup of $3.00 was to be added onto what the item cost.

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We have 22 tickets sold, and 20 seats. This means that at least 2 passengers must not show up (otherwise, at least 21 passengers will be present, and there wouldn't be space for them).

Considering each passenger as independent, you can think of this experiment. Suppose you toss a coin for each passenger. If the coin lands on heads, the passenger shows up. If it lands on tails, the passenger doesn't show up.

But the coin is unfair: it has a 0.91 probability of landing on heads, and thus 0.09 probability of landing on tails.

This implies that the probability of having exactly k tails is

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Finally, remember the rule to negate events:

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So, if we lose with probability 0.39, we win with probability

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