Question

Nexus bought 19 biofuel cans, costing 58 cents each. The total cost of the cans to the nearest 10 is .

• A. $\$12$
• B. $\$10$
• C. $\$15$

Answer 1

The correct option is A $\$12$

Cost of 1 biofuel can $=58\text{cents}$

Total number of cans $=19$

So, total cost of all the cans $=19\times 58$

Now, 19 can be rounded off to 20,
And, 58 can be rounded off to 60 as shown:

$\Rightarrow 19\times 58\approx 20\times 60$
$\Rightarrow 20\times 60=2\times 6\times 100=1200$
$19\times 58\approx 1,200\text{cents}$
$100\text{cents}=\$1$
$\Rightarrow 19\times 58\approx 1200\text{cents}=\$12$

So, It will cost Nexus approximately $\$12$ for all the biofuel cans.