Fiscal deficit was 4% of the GDP in 2015 and that increased to 5% in 2016. If the GDP increased by 10% from 2015 to 2016, the percentage increase in the actual fiscal deficit is ____________.

The correct option is 37.50.

Let us break down the solution step-by-step to find the percentage increase in the actual fiscal deficit from 2015 to 2016.

Step 1: Define the variables for the GDP in 2015 and 2016
Let the Gross Domestic Product (GDP) of the country in the year 2015 be represented as:
${\text{GDP}}_{2015}=x$
According to the problem, the GDP increased by 10% from 2015 to 2016. Therefore, the GDP in 2016 is:
${\text{GDP}}_{2016}=x+0.10x=1.10x$

Step 2: Calculate the actual fiscal deficit in 2015 and 2016
In 2015, the fiscal deficit was 4% of the GDP. Thus, the actual fiscal deficit in 2015 was:
${\text{Fiscal Deficit}}_{2015}=4\%\text{of}{\text{GDP}}_{2015}=0.04x$
In 2016, the fiscal deficit increased to 5% of the GDP. Thus, the actual fiscal deficit in 2016 was:
${\text{Fiscal Deficit}}_{2016}=5\%\text{of}{\text{GDP}}_{2016}=0.05\times (1.10x)=0.055x$

Step 3: Calculate the percentage increase in the actual fiscal deficit
The increase in the actual fiscal deficit is the difference between the deficits of 2016 and 2015:
$\text{Increase}=0.055x-0.04x=0.015x$
Now, we calculate the percentage increase with respect to the initial actual fiscal deficit in 2015:
$\text{Percentage Increase}=\left(\frac{0.015x}{0.04x}\right)\times 100$
Simplifying the fraction:
$\text{Percentage Increase}=\frac{15}{40}\times 100=\frac{3}{8}\times 100=37.50\%$

Thus, the percentage increase in the actual fiscal deficit is 37.50%.