Answer:
percentage decrease is 70%
Step-by-step explanation:
To find percentage decrease of 2 quantities, we have to find the difference of the quantities and divide by the original quanity. Then we multiply by 100 to find the PERCENTAGE.
We will use formula:
![\frac{New-Old}{Old}*100](https://tex.z-dn.net/?f=%5Cfrac%7BNew-Old%7D%7BOld%7D%2A100)
Where
"New" is the latest quantity
"Old" is the first (previous) quantity
Here, New = 5.3 & Old = 17.71
We substitute into formula and find:
![\frac{New-Old}{Old}*100\\=\frac{5.3-17.71}{17.71}*100\\=-0.700*100\\=-70](https://tex.z-dn.net/?f=%5Cfrac%7BNew-Old%7D%7BOld%7D%2A100%5C%5C%3D%5Cfrac%7B5.3-17.71%7D%7B17.71%7D%2A100%5C%5C%3D-0.700%2A100%5C%5C%3D-70)
So we can say that the percentage decrease is 70%
Answer:
the third answer
Step-by-step explanation:
210 because 3 times 70 is 210. so 210 cm