Percentages

How to calculate original number after percentage increase

Current number/1.0X

A shoe store is offering a 35% discount at its end-of-year sale. Find the original price of an item whose discounted price is 1820

To find the original price, divide the discounted price by 0.65 (1 - 0.35). This accounts for the remaining 65% of the original price after applying the 35% discount.

A lake now contains 24000 megalitres. Find how much water the lake had 1000 years ago if in the last 1000 years the volume has: risen by 80 percent

divide the current volume by 1.8 (1 + 0.80).

Calculate the total increase or decrease in a quantity when: it is increased by 10% and then decreased by 10%

pretend the amount is 100, increase by 10% to get 110, then decrease by 10% to find the final amount, which will be 99. so, it decreases by 1%.

how do you find out how many percent something has increased

Difference/initial value x100

if depreciation rate of 30%, find value after 3 years

multiply by (0.70)3

better or worse than depreciated value?

if less, worse. If more, better.

what’s very slay about a% of b and b% of a

they’re the same cuz both equations equal ab/100

How to calculate mean in a frequency table

Multiply ALL 1st and 2nd column values and add them tgt for the total, then divide by number of entries (e.g. if 22 ppl were surveyed it will be 22)

range for frequency table data?

legit just the range of the non-frequency column

Mode for frequency table data?

Value with the highest tally/frequency