The following graph shows the sale of few items of a garment company for three months.

What is the percentage of the sale of the least selling item in the three months over the total sale of the company?

The correct option is 16%.

From the given graph titled "Monthly Sales (in mn units)", we can observe the sales of five different garment items (Shirt, Trouser, Coat, T-shirt, and Jacket) over three months (January, March, and May):

1. Sales for each garment item across the three months:
• Shirt: January = 3, March = 8, May = 12
Total Shirt Sales = 3 + 8 + 12 = 23 mn units

• Trouser: January = 5, March = 9, May = 14
Total Trouser Sales = 5 + 9 + 14 = 28 mn units

• Coat: January = 7, March = 10, May = 11
Total Coat Sales = 7 + 10 + 11 = 28 mn units

• T-shirt: January = 4, March = 6, May = 10
Total T-shirt Sales = 4 + 6 + 10 = 20 mn units

• Jacket: January = 6, March = 7, May = 13
Total Jacket Sales = 6 + 7 + 13 = 26 mn units

2. Identification of the least selling item:
Comparing the total sales for each item:
Shirt = 23 mn units
Trouser = 28 mn units
Coat = 28 mn units
T-shirt = 20 mn units
Jacket = 26 mn units

The item with the lowest total sales is the T-shirt, with a total of 20 mn units.

3. Total sales of the company across all items:

$\text{Total Sales}=23+28+28+20+26=125\text{mn units}$

4. Percentage of the sale of the least selling item over total sales:

$\text{Percentage}=\left(\frac{\text{Sales of least selling item (T-shirt)}}{\text{Total Sales of the company}}\right)\times 100$

$\text{Percentage}=\left(\frac{20}{125}\right)\times 100=16\text{\%}$

Thus, the percentage of the sale of the least selling item in the three months over the total sale of the company is 16%.