9,000,000,000 is the best estimate of the number of bottles sold this year and last year
<h3>What is Number system?</h3>
A number system is defined as a system of writing to express numbers.
Given,
Current year consumers purchased 7,234,267,990 bottles of water
Last year consumers purchased 2,000,900,999 bottles of water.
We need to find the best estimate of the number of bottles sold current year and last year.
The best estimate means rounding up to the nearest whole number.
The estimate of the bottles sold this year and last year from the above value is:
= 7,000,000,000 + 2,000,000,000
= 9,000,000,000
Hence, 9,000,000,000 is the best estimate of the number of bottles sold this year and last year
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