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vaieri [72.5K]
3 years ago
12

How can you quickly calculate 20 percent of any bill amount?

Mathematics
2 answers:
il63 [147K]3 years ago
8 0

The answer is C an example is 20% of $20 is 4, so you would lose the zero and double the 2 to get 4

Radda [10]3 years ago
4 0

Answer:

C. Round the amount to the nearest $10, remove the zero in the ones place, and double the resulting amount.

Step-by-step explanation:

The percentage is quite present in our day to day, but still generates doubt and confusion at the time of doing the accounts. We use percentages to calculate discounts offered at stores, interest rates on financing, profits obtained from the sale of a particular product, etc.

An easy way to quickly calculate 20% of any invoice value is what is described in letter C.

For example: 20% of 100 dollars is 20 dollars. To calculate this quickly, you must remove the last zero from the number 100 and multiply the remainder by 2.

Removing the last zero from the number 100 will result in the number 10. Multiplying the number 10 by 2, the result will be 20. Thus, one can conclude that the 20% of 100 $ is 20 $.

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What is the simplified form of the following expression? 5sqrt 8-sqrt18-2sqrt2
spayn [35]

Answer:

5 sqrt2.

Step-by-step explanation:

sqrt8 = sqrt4 * sqrt2 = 2 sqrt2

sqrt18 = sqrt9 * sqrt2 = 3 sqrt2

So simplifying:

5sqrt 8 - sqrt18 - 2 sqrt2

= 5*2sqrt2 - 3 sqrt 2 - 2 sqrt2

= 10 sqrt2 - 5 sqrt2

= 5 sqrt2 (answer).

7 0
3 years ago
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The area of a rectangle is 56 cm. The length is 2 cm more than x and the width is 5 cm less than twice x. Solve for x. Round to
Black_prince [1.1K]
 Length = x + 2  (because it is 2 cm more than x)
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  Subtract 54 on both sides of equation to make the right side zero. 2x2 - x - 64 = 0  then use the quadratic formula x = (-b ± √(b2 - 4ac)) / 2a where:a = 2b = -1c = -64 Plug in these values into the formula. x = (1 ± √(1 - 4(-128))) / 4 x = (1 ± √(513)) / 4 x = (1 ± 22.65) / 4 x = (1 + 22.65) / 4          and          x = (1 - 22.65) / 4 x = 5.91                          and          x = -5.41  Check the validity of the x values by adding them to the length and width.  If the length or width should be a negative value, then that value of x is not acceptable. Now x = 5.91 Length = 5.91 + 2  (positive value.)Width = 2(5.91) - 5  ( positive value.) x = 5.91    If we look at this -- x = -5.41, Both length and width will be negative values. We reject this value of x.  The answer is x = 5.91

Hope I helped and sorry it was really long
6 0
3 years ago
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Cognitive maps allow organisms to
Bess [88]

Answer:

C

Step-by-step explanation:

3 0
3 years ago
Add and simplify: 9/16 + 1/2=?
kozerog [31]
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= (9+8)/16
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= 16/16+ 1/16
= 1+ 1/16
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The final answer is 1 1/16~
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