Answer:
Option a is correct
300 is the best estimate of 42% of 756
Step-by-step explanation:
To find the best estimate of 42% of 756.
First find one percent, which is where you can move the decimal 2 places to the left i.e,
giving you the number 7.56
Now, multiply 42 by 7.56 i.e,

therefore, the best estimate of 42% of 756 is, 300