Question

A tank contained 40 gallons of water at first. Due to a leak at the bottom of 
the tank, the amount of water in the tank decreased to 36 gallons after 1 hour. After 
another hour, the amount of water in the tank was 32 gallons. 
a) Find the percent decrease in the amount of water from 40 gallons to 36 gallons. 
Round your answer to 1 decimal place. [2]

Answer 1

% decrement = ( final - initial )/initial ×100

initially tank contains = 40 gallon
finally tank contian =36 gallon

% decrement = (36-40)/40× 100
= -10 %

here negative sign indicate decreament .

magnitude of decrement= 10℅

2) in decimal decrement fraction = 10/100 =0.1