During a grand prix car race, the tyres on a car are reduced in mass by 3%. if their mass is 388 kg at the end of the race, what was their mass at the start?

Their mass at the start was 400 kg.

Step-by-step explanation:

Given:

The tyres on a car during a grand prix race are reduced in mass by 3%. Their mass is 388 kg at the end of the race.

Now, to find the mass at the start.

Let the mass at the start be .

According to question:

⇒

⇒

⇒

Dividing both sides by 0.97 we get:

⇒

Therefore, their mass at the start was 400 kg.

step-by-step explanation:

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of