Consider the statements with respect to the degree of accuracy in estimating.
Assertion (A): The accuracy to be observed in preparing an estimate depends on the rate of the item and unit of payment.
Reason (R): The higher the rates the greater should be the accuracy with which the quantities are calculated.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.