1. Convert 32°C into K
2. Convert 80°F into C
3. Convert 580°F into K

1. 305.15K

2. 26.67C

3. 577.59K

Explanation:

When converting Celsius to Kelvin, just add +273.15 to the given Celsius.

: C + 273.15

If Fahrenheit to Celsius, subtract 32 to the given Fahrenheit and divide it by 1.8

: (Fahrenheit - 32) / 1.8

If Fahrenheit to Kelvin, just do the same as you did in converting F to C but add 273.15

: (Fahrenheit - 32) /1.8 + 273.15     ...like this

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form