Energy saving

They were released three different, independent inventions saving 20%, 24% and 15% energy. Some considered that while the use of these inventions, the total savings will be 20% + 24% + 15% = 59%. Is this true? How much percent of energy will save all three inventions together?

Correct answer:

p =  48.32 %

Step-by-step explanation:

q1=20%=120100=0.8 q2=24%=124100=0.76 q3=15%=115100=0.85  q=1q1 q2 q3=10.8 0.76 0.85=302625=0.4832  p=100 q=100 0.4832=120825=120825%=48.32%

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