Theory question 108
Data PresentationThe table shows the monthly expenditure (in percentage) of Mr. Okafor's salary.
Item: Food and drinks, Fuel, Rent, Building Project, Education, Savings
Percentage (%): 35, 7.5, 10, 15, 17.5, x
(a) Calculate the percentage of Mr. Okafor's salary that was put into savings.
(b) Illustrate the information on a pie chart.
(c) If Mr Okafor's annual gross salary is $28,800.00 and he pays tax of 12%, calculate: (i) his monthly tax; (ii) amount saved each month.
Show the model answer
(a) x = 100 − (35 + 7.5 + 10 + 15 + 17.5) = 15%
(b) Angles (× 3.6°): food 126°, fuel 27°, rent 36°, building 54°, education 63°, savings 54°; draw and label the sectors
(c)(i) Monthly salary = 28,800 ÷ 12 = $2,400; tax = 12% of 2,400 = $288
(ii) Savings = 15% of $2,400 = $360 a month
Percentages of a whole always add up to 100.