How can you use proportinal reasoning to solve problems involving percent?

Which of the following is the correct ratio for converting kilograms to grams

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)