Adollar bill weighs about 1gram. use this information to estimate the number of dollar bills it would take to weigh 1 kilogram

The prefix "kilo" means 1,000.  Therefore, we can infer that one kilogram has 1,000 grams.

To answer you question, the answer should be 1️⃣0️⃣0️⃣0️⃣ because if each dollar bill weighs 1 gram and there are 1000 grams
in a kilogram that would mean it would take 1️⃣0️⃣0️⃣0️⃣ dollar bills to make a kilogram.

Hope this help.
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8,400-6,400=xx/6,400anyways the percent increase is 31.25% or 0.3125 you can round if you can