This year consumers purchased 5,234,267,990 bottles of water. Last year consumers purchased 1,000,900,999 bottles of water. Which is the best estimate of the number of bottles sold this year and last year? plzz help

The water company charges a residential customer $41 for the first 3,000 gallons of water used and $1 for every 200 gallons used over 3000 gallons. if the water bill was $58 how many gallons of water were usedanswersa 3400 gallonsb 6000 gallonsc 6400 gallons d 7000 gallons