Question

6. While checking out of Wal-Mart, a customer was erroneously charged tax by multiplying by 2/5
instead of 5/2. What is the percentage error in the calculation?
a) 24 percent
b) 54 percent
c) 74 percent
d) 84 percent​

Answer 1

Given:-

•A customer was erroneously charged tax by multiplying by 2/5 instead of 5/2.

To Find:-

•What is the percentage error in the calculation?

Solution:-

Let consider the number be 100.

Now,

100 of 2/5 = 40

Now again,

100 of 5/2 = 250

Now we have to find difference between both numbers

Difference = 250 - 40 = 210

Now find percentage error in the calculation

As we know

$\: \: \sf \: percentage = \frac{difference}{total } \times 100$

Now put the values here

$\: \: \sf \: percentage = \frac{210}{250} \times 100 \\ \\ \: \: \sf \: percentage = 84 \: percent$

Hence,84% error in the calculation.