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Tutor profile: Sufiyan A.

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Sufiyan A.
Tutor for 6 years & A Problem Solver
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Questions

Subject: Basic Math

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Question:

A shopkeeper gives a discount of 50% on all items. He further gives a seasonal discount of 30% on the discounted price and a promotional discount of another 20% on the final price. Find the selling price of a product worth $100.

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Sufiyan A.
Answer:

After an initial discount of 50%, price = $100(1-0.50) = $50 After another seasonal discount of 30%, price = $50(1-0.30) = $35 After the final discount of 20%, price = $35(1-0.20) = $28 Hence, the final selling price of a product worth $100 in $28.

Subject: Statistics

TutorMe
Question:

The average weight of a group of 10 girls is 50kg. If another girl is added to the group, the average increases to 52kg. Find the weight of the last girl.

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Sufiyan A.
Answer:

Let the weight of the last girl be x. Total weight of the first 10 girls = (Average weight*Number of girls) = (50*10) = 500kg After the last girl is added to the group, Total weight=500+x New Average = (500+x)/11 = 52 (500+x)=52*11 x=572-500 x=72 Hence, the weight of the last girl is 72kg.

Subject: Algebra

TutorMe
Question:

If the equation x^2-4x+k has 1 real root, Find the value of k.

Inactive
Sufiyan A.
Answer:

If the equation has only 1 real root, the discriminant should be 0. Therefore, (-4)^2-4(1)(k)=0 16-4k=0 16=4k 4=k Hence, the value of k is 4.

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