Answer:
90,800
Step-by-step explanation:
This month's usage of the spinach is 21% more, which means you divide the percentage increased and add 100% (or 1 if you do it the decimal way).
109868/1.21 = 90800
Double check-
Method 1
90800 mupltiply how much has increased (21%)
90800*0.21 = 19068
19068 plus the use of last month (90800)
19068+90800 = 109868
Method 2
90800 mupltiply how much has increased & last months usage (121%)
90800*1.21 = 109868
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