Step 1: Find that the selling price is higher than the original price:

5-3=2 (yuan)

Step 2: Find that it is higher than the original price:

2÷3× 100 %

≈66.7% (Note: A few percent higher than the original price refers to the standard quantity based on the original price, that is, divided by the original price).

Multi-digit division law:

(1) Divide from the high order of the dividend, and look at the first few digits of the dividend. If it is not enough, look at one more digit.

(2) Write the quotient on the divisor. If the divisor is not enough, put the quotient 0 on it.

(3) The remainder of each division must be less than the divisor. Place the digits of the divisor in the right of the remainder and continue the division.