Question

the cost of 9kg of rice is $111.24a)what is the cost of 10kg?b)what is the cost of 10.6kg?

Answer 1

SOLUTION:

Case: Unit rates

Given: 9kg of rice cost $111.24

First we calculate the cost per kg

Since 9kg cost $111.24

1kg will be:

$\begin{gathered} 1kg\text{ of rice =}\frac{111.24}{9} \\ 1kg\text{ of rice = 12.36} \end{gathered}$

1kg costs $12.36

a) the cost of 10kg

The cost of 10kg will be:

$\begin{gathered} 10kg\text{ of rice will be} \\ =\text{ 10 }\times12.36 \\ =\text{ 123.60} \end{gathered}$

The cost of 10kg of rice is $123.60

b) the cost of 10.6kg

The cost of 10.6kg will be:

$\begin{gathered} 10.6kg\text{ of rice will be} \\ =10.6\text{ }\times12.36 \\ =\text{ 131.0}2 \end{gathered}$

The cost of 10.6kg of rice is $131.02

Final answer:

a) The cost of 10kg of rice is $123.60

b) The cost of 10.6kg of rice is $131.02