From 3 hours to 30 minutes percentage

A decrease to 30 minutes from 3 hours corresponds to a 83.3% relative decrease, or a reduction to a time period that is 16.7% of the original period (depending on a more precise meaning of your question, see below)

Steps:

Relative decrease from y to x:

100*(y-x)/y in %

So y = 3 hr and x = 30 min. Rewrite to fractions: x=6/2 hr, y=1/2 hr

rel decrease =  

Percentage of reduced time period:

the 30 minutes time period corresponds to of the full period of 3hr, or 16.67% (this is in case your question was asking for the percentage the remaining amount represents of the total amount).

Let me know if you have questions.

i can't read the graph

step-by-step explanation:

the answer is 99.