Maria buys $$$n$$$ pencils that $$$\operatorname{cost} p$$$ cents each. She pays with a $$$\$ y$$$ note. Find, in terms of $$$n, p$$$ and $$$y$$$, the amount of change Maria receives. Give your answer in cents. ..................................... cents

Mathematics

IGCSE&ALevel

CAIE

Exam No：0580_s21_qp_23 Year：2021 Question No：6

Answer:

$100 y-n p$

Knowledge points:

E1.16.1 Use given data to solve problems on personal and household finance involving earnings, simple interest and compound interest. (Includes discount, profit and loss.) (Knowledge of compound interest formula is required.)

E1.16.2 Extract data from tables and charts.

E2.1.1 Use letters to express generalised numbers and express basic arithmetic processes algebraically.

E2.1.2 Substitute numbers for words and letters in complicated formulae.

E2.1.3 Construct and rearrange complicated formulae and equations. (e.g. rearrange formulae where the subject appears twice.)

Maria buys $$\(n\)$$ pencils that $$\(\operatorname{cost} p\)$$ cents each. She pays with a $$\(\$ y\)$$ note. Find, in terms of $$\(n, p\)$$ and $$\(y\)$$, the amount of change Maria receives. Give your answer in cents. ..................................... cents

Answer:

Knowledge points:

Solution:

Maria buys $$\(n\)$$ pencils that $$\(\operatorname{cost} p\)$$ cents each. She pays with a $$\(\$ y\)$$ note. Find, in terms of $$\(n, p\)$$ and $$\(y\)$$, the amount of change Maria receives. Give your answer in cents. ..................................... cents

Answer:

Knowledge points:

Solution:

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