What is It Now, let's discuss the earlier wond problem. Example 1 Jessy ate 4 parts of a chocolate bar. This means she ate 80% of the chocolate bar. How many parts are there in the chocolate bar? First Step: What are given in the problem? The given are 4 parts of the chocolate bar, which represents 80% of chocolate bar. Second Step: What do we need to find out? We need to find out the total part of the whole chocolate bar which is the base. Third Step: What does 4 represent? It represents the percentage (or part of the whole). 80% Fifth Step: What does 80% represent? It represents the rate (80 out of 100). Now, let the whole part of chocolate bar be n. So, we write B = P divided by R. Base = Percentage divided by Rate 1 2 3 102 103 104 105 RON 10% 10% 10% 10% Whole Chocolate bar n = 4 + 80% 4x100 5 100 = 4x 8D 80 n = 4 + 100 80 Therefore, the chocolate bar has 5 parts, in which 4 parts have been enten by Emmie. The bar model is also helpful in solving the problem,​