[Fixed] How to get total percent distribution out of 100% for the underlying denominator for each column in angular 8

Issue

I have simple function of calculating the sum of numbers and strings in columns in a table. The sum works well and gives me correct results. The issue is that whenever I try to divide the total sum of each column with 100 I end up with wrong values

Scenario A

I have a sum of 969.35 in column A, whenever I divide the value with 100 I expect to get 9.69 but I end up with 0.51 . Am not sure why this is being calculated as so.

This is my implementation of getting the sum

getSum(columnNumber) {
    let sum = 0;
    const columnNumberToPropertyMap = [
      "id",
      "teamNumber",
      "rural",
      "completed",
      "entirehouseholdabsent",
      "postponed",
      "refused",
      "vacant",
      "dwelling"     
    ];
    const property = columnNumberToPropertyMap[columnNumber];
    return this.rural.reduce((acc, curr) => {
      //const adder = Number(curr[property]) || 0;
      const adder = isNaN(Number(curr[property])) ? 0 : Number(curr[property]);
      sum = acc + adder
      return sum;
    }, 0).toFixed(2);
  }

the above code works well as I can get the sum of each coiumn.

How I am trying to get the percentage

 getSum(columnNumber) {
        let sum = 0;
        let percentage = 0;
        const columnNumberToPropertyMap = [
          "id",
          "teamNumber",
          "rural",
          "completed",
          "entirehouseholdabsent",
          "postponed",
          "refused",
          "vacant",
          "dwelling"     
        ];
        const property = columnNumberToPropertyMap[columnNumber];
        return this.rural.reduce((acc, curr) => {
          //const adder = Number(curr[property]) || 0;
          const adder = isNaN(Number(curr[property])) ? 0 : Number(curr[property]);
          sum = acc + adder
          percentage = (sum)/100;
          return percentage ;
        }, 0).toFixed(2);
      }

What am I doing wrong?

Solution

Do this it will be fine. You are dividing each time which is causing issue.
Percentage should be outside of reduce loop.

(this.rural.reduce((acc, curr) => {
          //const adder = Number(curr[property]) || 0;
          const adder = isNaN(Number(curr[property])) ? 0 : Number(curr[property]);
          sum = acc + adder
          percentage = sum;
          return percentage ;
        }, 0) / 100).toFixed(2);