Institution: AGRANI BANK LTD Exam: Agrani bank Ltd - Officer 04.07.2008
Topic: Arithmetic Mathematics (পাটিগণিত), Subject: Mathematics (সাধারণ গণিত)

Best Answer Explained in Below-:

To understand why the correct answer is B) 45%, let’s look at what it means to express a decimal as a percentage. A percentage is simply a way of expressing a number as a fraction of 100. To convert a decimal to a percentage, you multiply the decimal by 100.

Let's apply this to 0.45:

1. Take the decimal: 0.45.
2. Multiply by 100:
\[
0.45 \times 100 = 45.
\]
3. This result means that 0.45 is equivalent to 45%.

Now, let’s evaluate the other options to confirm they do not equal 0.45:

- A) 0.045%: Converting this to a decimal,
\[
0.045\% = \frac{0.045}{100} = 0.00045,
\]
which is much smaller than 0.45.

- C) 0.45%: This also converts to
\[
0.45\% = \frac{0.45}{100} = 0.0045,
\]
again significantly less than 0.45.

- D) 0.0045% converts to
\[
0.0045\% = \frac{0.0045}{100} = 0.000045,
\]
which is even smaller.

Thus, the only option that equals 0.45 when expressed as a percentage is B) 45%.