Ex 14 : Sand costs \( \$ 98.90 \) per tonne. This cost includes a tax of \( 15 \% \), Calculate the amount of tax paid per tonne of sand.

In a school Auditorium, there are three types of rows arrangements possible for watching programs: rows of 20 students per row, or rows of 25 students per row, or rows of 40 students per row. Find the least number of students required for any one of these arrangements so that all the students can be accommodated in each of these arrangements.

A company was penalized by the government act for low quality production. If the company has 3 share holders Umer, Usman \& \( \& \) Furqan investing in the ratios of \( 2: 3: 4 \) and the amount of penalty is Rs. 456 , 885 , 67 . Find the amount of penalty paid by each of 3 share holders.

51. एक आदमी 5000 रू. की धनराशि का कुछ भाग \( 4 \% \) तथा शेष \( 5 \% \) की साधारण ब्याज दर पर उधार देता है। उसे 2 वर्ष्षों के बाद कुल ब्याज 440 रू. मिलता है। उपरोक्त दरों में से प्रत्येक पर लगाई गई राशि का अनुपात बताए- \( \begin{array}{ll}\text { (1) } 4: 5 & \text { (2) } 3: 2 \\ \text { (3) } 5: 4 & \text { (4) } 2: 3\end{array} \)

0. On a winter day, the temperature of Namche Bazar in the morning was \( -5^{\circ} \mathrm{C} \). It is increased by \( 10^{\circ} \mathrm{C} \) in the day time and again decreased by \( 6^{\circ} \mathrm{C} \) in the evening. a) Show this information in a number line. b) Write a mathematical expression to show the given information. c) Calculate the temperature of Namche Bazar in the evening.

HW Riya spends \( 66 \frac{2}{3} \% \) of her income. If his incom increases by \( 16 \% \) and savings increase by \( 17 \% \) find the increase in his expenditure.