Your employee can normally restock 200 items per hour. After 8 hours on the job, her rate decreases 10% per hour. At hour 12 in a long shift

Your employee can normally restock 200 items per hour. After 8 hours on the job, her rate decreases 10% per hour. At hour 12 in a long shift, how many items can she restock per hour?
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Guest [Entry]

"Ans:

@9th hour=200 -20= 180 (where 10% of 200 is 20,rate decreases)

@10th hour= 180-18=* ans:162 (where 10% of 180 is 18)

@11th hour= 162-16.2=ans*145.8 or 145 4/5 (where 10% of 162 is 16.2)

@final hour= 145.8-14.58=130.42 or 130 21/50 (where 10% of 145.8 is14.58)"