Question

Later she paid Rs 919 to the junk collectors. When she sold the junk she got these notes and coins from Dinu.



Now you make a record in her diary.
Find out how much she earned this time.

Answer 1

We do it as follows:

5 notes of 100 rupee
5 $\times$ 100 = Rs 500

1 note of 50 rupee
1 $\times$ 50 = Rs 50

18 notes of 10 rupee
18 $\times$ 1 = 18
18 $\times$ 10 = Rs 180

9 notes of 20 rupee
9 $\times$ 2 = 18
9 $\times$ 20 = Rs 180

28 coins of 5 rupee
20 $\times$ 5 = 100
8 $\times$ 5 = 40

$$\begin{gathered} \begin{array}{ccc}1& 0& 0\\ +& 4& 0\end{array} \\ \underline{\overline{\begin{array}{ccc}1& 4& 0\end{array}}} \end{gathered}$$

28 $\times$ 5 = Rs 140

Money I got = Rs 500 + Rs 50 + Rs 180 + Rs 180 + Rs 140
= Rs 1050
$\begin{array}{cccc}& & & \\ & \stackrel{2}{5}& 0& 0\\ & & 5& 0\\ & 1& 8& 0\\ & 1& 8& 0\\ +& 1& 4& 0\\ 1& 0& 5& 0\\ & & & \end{array}$

Money I earned = Rs 1050 − Rs 919
= Rs 131
$\begin{array}{ccccc}& {}^0\cancel{1}& {}^{1}0& {}^4\cancel{5}& {}^{1}0\\ -& & 9& 1& 9\\ & 0& 1& 3& 1\\ & & & & \\ & & & & \end{array}$