The average of the sales of an electronics shop in the years 1991,
The average of the sales of an electronics shop in the years 1991, 1992, 1993 and 1994 is 2000, and that for the years 1992, 1993, 1994 and 1995 is 2200. If the sales in 1995 are 1800, find the sales in 1991.
वर्ष 1991, 1992, 1993 और 1994 में एक इलेक्ट्रॉनिक्स दुकान की बिक्री का औसत ₹2000 है,और वर्ष 1992, 1993, 1994 और 1995 के लिए बिक्री का औसत 2200 है। यदि 1995 में बिक्री 1800 है तो 1991 में बिक्री ज्ञात कीजिए ?
Detailed Solution & Logic
Correct Answer:
1000
$ \displaystyle \frac{S_{91}+S_{92}+S_{93}+S_{94}}{4}=2000 S_{91}+S_{92}+S_{93}+S_{94}=8000 $
$ \displaystyle \frac{S_{92}+S_{93}+S_{94}+S_{95}}{4}=2200 S_{92}+S_{93}+S_{94}+S_{95}=8800 $
Subtracting,
$ S_{95}-S_{91}=800 $
Given $S_{95}=1800$,
$1800-S_{91}=800 S_{91}=1000 $
Answer = 1000
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