Answer:
394,200,00
Step-by-step explanation:
Hi, the hint is similar to the answer.
Seems you know it already.
So in a second the heart beats
1/0.8 = 1.25
There's are 31,536,000 seconds in a year
31,536,000 • 1.25 = 39,420,000
The boy's heart beat 39,420,000 time a year
For 10 years we multiply how many times he breathes a year by 10
= 39,420,000 × 10
= 394,200,000
Therefore, he breathes 394,200,00 times in 10 yr