$\frac{1}{10}=0.1$

So, $5+0.1+0.1=5.2=5.20$

On comparing the decimals, we see that till thousandths place, digits are same. But digit at ten thousandths place in 123.040605 is greater than the digit at ten thousandths place in 123.040506. So, 123.040506 is smaller than 123.040605.

$\text{3.4 =}\frac{34}{10}$ 
      $=\frac{17\times 2}{5\times 2}$
      $=\frac{17}{5}\text{in simplest form.}$

Amount paid = ₹30

Total bill = ₹5.50 + ₹20.75 = ₹26.25

Amount returned by shopkeeper = ₹30 - ₹26.25 = ₹3.75

We know that ₹1 = 100 paise.
$⟹\text{1 paisa =}₹\frac{1}{100}=₹0.01$

$\therefore$ 90 paise = 90 × ₹0.01 = ₹0.9 

So, 13 rupees and 90 paise = ₹(13+0.9) = ₹13.9 = ₹13.90

The numbers left to the decimal are written in words like normal numbers but the numbers right to the decimal point are written as a digit at once.

So the given number in words will be, forty-five point seven nine 

The percentage has increased because 90.98 is greater than 90.89. The increase is (90.98 - 90.89) = 0.09

Since there are 4 divisions between 1 and 2, each division corresponds to the fraction $\frac{1}{4}.$

But, $\frac{1}{4}=\mathrm{0.25.}$

So, the point A represents the decimal $=1+0.25+0.25=1.50$