Question

John brought a chocolate bar worth $\$3.45$. He liked the chocolate so much that he brough 6 more chocolate bars. How much did he spend on 7 chocolate bars?

• A. $25.15$
• B. $24.15$
• C. $241.5$
• D. None of the above

Answer 1

The correct option is B $24.15$

To find total amount of money spent by John on 7 chocolate bars, we need to find $3.45\times 7$
Consider $3.45$ as whole number $345$ by shifting decimal point 2 units to the right.
$345\times 7=2415$
Now, compensate movement of the decimal point in $3.45$ by shifting the decimal point in $2415.0$ two units to the left i.e $24.15$
$\therefore$ $3.45\times 7=24.15$