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sairasheikh86
1f the compound interest on a certain sum at 5% for 3 years is 1262 $ what is the simple interest
ans is 1200

the compound interest on a certain sum of 5% p.a for two years is $102.50 what is the compound interest at 4% per p.a
ans is 81.6

a rectangular box with a square base contains 6 cubic feet.if the height of the box is 18 inches how many feet are there in the side of each base
ansr is 2


a room is 10 meter long and 6 meter broad find the cost of covering its floor with the carpet 60cm wide at the rate of $2.25 per meter
ans is $225

can u please help me with explanation?

Let's work on the 2nd and 3rd questions first:

Question 2: a rectangular box with a square base contains 6 cubic feet.if the height of the box is 18 inches how many feet are there in the side of each base

The volume of the box will be Area of the base * Height

You need to know how to convert feet to inches. 1 foot = 12 inches (this will be given)
So Volume = \(6 foot^3 = 6*12*12*12 inches^3\)

(Think of it this way: 6 foot^3 = 6 * 1 foot * 1 foot * 1 foot = 6 * 12 inches * 12 inches * 12 inches)

Area of the base = Side^2 = Volume/Height = 6*12*12*12/18 = 4*12*12

Side = 2*12 = 24 inches = 2 foot

Question 3: a room is 10 meter long and 6 meter broad find the cost of covering its floor with the carpet 60cm wide at the rate of $2.25 per meter

The room is 1000 cm (= 10m) long and 600 cm broad. The width of the carpet is 60 cm so you will need 10 sheets placed next to each other to cover the entire width of the room. The length of each sheet should be equal to the length of the room i.e. 1000 cm (= 10 m) long. So you need 10*10 = 100 m of the carpet length. Cost of 100 m of the carpet will be 2.25*100 = $225

On to question 1: 1f the compound interest on a certain sum at 5% for 3 years is 1262 $ what is the simple interest

You first need to understand the basics of compound interest and how it is different from simple interest. Thereafter, this question can be easily solved. Mind you, rather than a 3 yr time frame, a 2 yr time frame is more probable as far as GMAT is concerned.

Check out this post for basics first: https://www.gmatclub.com/forum/veritas-prep-resource-links-no-longer-available-399979.html#/2011/0 ... imple-one/

Now, 1262 is the compound interest earned in 3 yrs. Say, compound interest earned in the first year is I.

1262 = 3I + 3*(.05)I + (.05)(.05)I (try to work out this expression from the concepts discussed in the post)
1262 = (3.1525)I
In a GMAT question, you would expect 1262 to be completely divisible by 3.1525 since you are not expected to make long calculations. 3 times 4 is 12 so try to find 3.1525*4 which you get as 12.61 (very close to 12.62)
Hence, I = 400

Simple interest is simply 3I (same interest every year) so SI = 3*400 = 1200



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