Final answer:
To find the percentage of a compared to the given expressions, use the formula (New Value - Old Value) / Old Value x 100%. The answers will be 4%, 20%, 56%, 180%, 250%, and 300% of a. To determine by how many percent each expression is bigger or smaller than a, subtract the percentage of a from 100%.
Step-by-step explanation:
To find the percentage of a compared to the given expressions, we can use the formula:
(New Value - Old Value) / Old Value x 100%
a. The expression 0.04a is 4% of a.
b. The expression 0.2a is 20% of a.
c. The expression 0.56a is 56% of a.
d. The expression 1.8a is 180% of a.
e. The expression 2.5a is 250% of a.
f. The expression 3a is 300% of a.
To determine by how many percent each expression is bigger or smaller than a, we can subtract the percentage of a from 100%.
a. 100% - 4% = 96%. So, it is 96% smaller than a.
b. 100% - 20% = 80%. So, it is 80% smaller than a.
c. 100% - 56% = 44%. So, it is 44% smaller than a.
d. 180% - 100% = 80%. So, it is 80% bigger than a.
e. 250% - 100% = 150%. So, it is 150% bigger than a.
f. 300% - 100% = 200%. So, it is 200% bigger than a.