Question

A man makes 60 articles in the first hour. His efficiency decreases by 25 % in the second hour, increases by
40% in the third hour, decreases by 33% in the fourth hour and increases by 50 % in the fifth hour. If the has to
work for more than one hours, then in which hour the average number of articles produced per hour then
would be minimum ?
(a) second hour
(b) after fifth hour
(c) third hour
(d) none of these
please explain​

Answer 1

Answer:

(b) after fifth hour work for more than one hours, then in which hour the average number of articles produced per hour then.

Answer 2

The answer is d) None of these, since the minimum number of articles are produced in the fourth hour.

Step-by-step explanation:

• Number of articles made in first hour = 60

In the second hour, efficiency decreases by 25%, hence,

• Number of articles made in the second hour $= 60 - 25\% of 60=60-(\frac{25}{100})\times 60= 60 -15 =45$

In the third hour, efficiency increases by 40%, hence,

• Number of articles made in the third hour $= 60 - 40\% of 60=60+(\frac{40}{100})\times 60= 60 +24 =84$

In the fourth hour, efficiency decreases by 33%, hence,

• Number of articles made in the fourth hour $= 60 - 33\% of 60=60-(\frac{33}{100})\times 60= 60 -20 =40$

In the fifth hour, efficiency increases by 50%, hence,

• Number of articles made in the fifth hour $= 60 + 50\% of 60=60+(\frac{50}{100})\times 60= 60 +30=90$

Thus, the minimum number of articles would be produced in the fourth hour (40 only).