Improving efficiency
The brilliant Italian automotive engineer Guglielmo Ronzoni came up in January 2019 with a design for a new luxury sedan, the Ronzoni Downhill.
But the 2019 edition did not sell well. People loved everything about it except one thing -- it used too much gasoline.
Mr. Ronzoni listened to the criticism. For this year's model, he made three improvements.
A subtle alteration to the shape of the chassis improved fuel efficiency by 20%.
Independent of this, a change in the design of the wheel base improved fuel efficiency by 30%.
Finally, independent of both the above, an improved engine improved fuel efficiency by 50%.
With all 3 improvements implemented, how much more fuel efficient is the 2020 Ronzoni Downhill over its predecessor? Give answer in percent.
The answer is 72.
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1 solution
The 2020 version uses (1 - 0.5) * (1 - 0.3) * (1 - 0.2) the amount of fuel as the 2019 version. This is equal to 0.28
Therefore, the new, bestselling 2020 Ronzoni Downhill is a whopping 72% more fuel efficient than its predecessor!