Question

You wish to mentally estimate the total cost of items that have the following prices: $1.85, $.98, $3.49, $9.78, and $6.18. Rounding off the items to the neares half dollar, your estimate of the total cost of these items is?

A. $23.00
B. $22.30
C. $22.50
D. $22.59

Answer 1

Answer: C. $22.50

Explanation:

First round off the given prices to the neares half dollar

$1.85 ≈ $2

$.98 ≈ $1

$3.49 ≈ $3.50

$9.78 ≈ $10

$6.18 ≈ $6

Now, the estimate of the total cost of these items =
`\$2+\$1+\$3.50+\$10+\$6=\$22.50`

Thus, he estimate of the total cost of these items is $22.50.

Hence, C is the right answer.

Answer 2

If you wish to mentally estimate the total cost of items, rounding off the items to the nearest half dollar, then you have to consider all five items separately.

Five items cost $1.85, $.98, $3.49, $9.78, and $6.18.

1. $1.85≈$2;

2. $0.98≈$1;

3. $3.49≈$3.50;

4. $9.78≈$10;

5. $6.18≈$6.

Then the total cost is

$2 + $1 + $3.50 + $10 + $6 =$22.50.

Answer: correct choice is C