Pie Charts

percentage difference between the number of books sold by seller Penguin and Pustak, $$ = 20 - 12 = 8 \ \% $$ now the required difference, $$ = \frac{2000 \times 8}{100} $$ $$ = 160 \ books $$

20% of the whole angle, $$ = \frac{20 \times 360}{100} $$ $$ = 72^{o} $$

Total number of books sold by seller Penguin in the year 2023, $$ = 2000 \times \frac{20}{100} \times \frac{10}{100} \times \frac{70}{100} $$ $$ = 28 \ books $$

Total books sold by seller Pustak, $$ = \frac{2000 \times 12}{100} $$ $$ = 240 $$ number of History books sold by seller Pustak, $$ = 140 $$ number of Geography books sold by seller Pustak, $$ = 240 - 140 = 100 $$ Required ratio, $$ = 140 : 100 $$ $$ = 7 : 5 $$

Total number of books sold by seller Jaico in 2021, $$ = \frac{2000 \times 30}{100} $$ $$ = 600 $$ Total number of books sold by seller Jaico in 2022, $$ = 2 \times 360 - 600 $$ $$ = 720 - 600 = 120 $$ Required percentage, $$ = \frac{600 - 120}{600} \times 100 $$ $$ = 80 \ \% $$

The family spent 15% on 'GGGG' and 25% on 'others', Hence required the ratio, $$ = 15 : 25 $$ $$ = 3 : 5 $$

According to the graph the family spend on food 20% of the total amount, Hence $$ = \frac{150,000 \times 20}{100} $$ $$ = Rs.30,000 $$

25% of the total amount spent on the others, Hence $$ = \frac{150,000 \times 25}{100} $$ $$ = Rs.37,500 $$

The family spent total 20% on transport and medical together, Hence $$ = \frac{150,000 \times 20}{100} $$ $$ = Rs.30,000 $$

The family spent 25% on others, which is the highest.