Calculate the Sum of Multiplication Table Results

Problem

Given two natural numbers start and end, write a function solution that returns the sum of the results of the multiplication tables from start to end. For example, if start = 4 and end = 25, the sum of all the results from the 4th multiplication table to the 25th must be calculated.

Constraints

• start and end are natural numbers between 1 and 100 inclusive.
• start is less than or equal to end.
• Each table is calculated up to the 9th multiplication.

Test Case

Explanation for Test Case 1

• When start = 4 and end = 5, the sum of all the multiplication results for the 4th and 5th tables is 405.

Explanation for Test Case 2

• When start = 10 and end = 12, the sum of all the multiplication results for the 10th, 11th, and 12th tables is 1485.

Explanation for Test Case 3

• When start = 1 and end = 3, the sum of all the multiplication results for the 1st, 2nd, and 3rd tables is 270.