Question

During a certain day, a worker made 81 parts. He usually does 45 parts per day. What was the percent by which he increased the number of parts he usually makes?

Answer 1

Increase by 80%

Explanation:

45 : 100%

81 : y

`(81)/(45) :(y)/(100)`

y × 45 = 81 × 100

45y = 8100

45y ÷ 45 = 8100 ÷ 45

y = 180

180% - 100% = 80%

Increase by 80%

Answer 2

The answer is 80%.

Explanation:

During a certain day, a worker made 81 parts.

He usually does 45 parts per day.

Number of extra parts made =
`81-45=36`

The percent by which he increased the number of parts he usually makes can be given as =
`(36)/(45)*100` = 80%

Therefore, on that day, the percent increased by 80%.