Answer

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**Hint:**We here have been given the number 42 and asked what percentage of 42 is 29.4. For this, we will assume the percentage to be x%. Then we will use the formula given as follows:

Any percentage, ‘P%’ of any number N, is given as:

\[R=N\times \dfrac{P}{100}\]

Where R is the resultant percent of N.

After that, we will put all the given values in this formula as a result of which we will get an equation in terms of ‘x’. Then, we will solve that equation and hence get our answer.

**Complete step by step answer:**

Here, we have been given the number and we have been asked what percent of this number, i.e. 42 is 29.4.

Now, let us assume that the required percentage is ‘x%’.

Hence, x percent of 42 is equal to 29.4.

Now, we know that when we have been given a principal number, let us assume it to be ‘N’, any percent of that number, let us assume that percentage to be ‘P%’, is given as:

\[R=N\times \dfrac{P}{100}\] …..(i)

Where R is the resultant percent of N.

Now, according to this question, we have:

N=42

P=x

R=29.4

Now, if we put all these values of N, P and R in equation (i), we can get an equation in terms of ‘x’ and we can solve it for ‘x’, hence obtain its value.

Hence, putting the values of N,P and R in equation (i) we get:

\[\begin{align}

& R=N\times \dfrac{P}{100} \\

& \Rightarrow 29.4=42\times \dfrac{x}{100} \\

\end{align}\]

Now, solving this equation to obtain the value of ‘x’, we get:

$\begin{align}

& 29.4=42\times \dfrac{x}{100} \\

& \Rightarrow \left( 29.4 \right)\left( 100 \right)=42x \\

& \Rightarrow 2940=42x \\

& \Rightarrow x=\dfrac{2940}{42} \\

& \therefore x=70 \\

\end{align}$

**Hence, the required percentage is 70%.**

**Note:**We have here used the formula \[R=N\times \dfrac{P}{100}\]. This is obtained as follows:

Now, the meaning of percentage is the amount of something in each ${{100}^{th}}$ of its part. Hence, if we have been given P of a number N is R, it means that R is the ${\dfrac{P}{100}}^{th}$ fraction of that number.

Hence, we get:

\[R=N\times \dfrac{P}{100}\]

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