Joey had

Joey had 70% of his money in a savings account. The rest of his money was in a cheque account.

(a). What percentage of his money was in his cheque account?

(b). He had $240 in his cheque account. How much money did he have in his savings account?

Correct answer:

a =  30 %
S =  560 USD

Step-by-step explanation:

$$\begin{gathered} s=70\% \\ a=100-s=100-70=30\% \end{gathered}$$

$$\begin{gathered} C=240\text{USD} \\ {r}_1=s\%=\frac{s}{100}=\frac{70}{100}=\frac{7}{10}=0.7 \\ {r}_2=a\%=\frac{a}{100}=\frac{30}{100}=\frac{3}{10}=0.3 \\ x\cdot r_2=C \\ x=C/r_2=240/0.3=800\text{USD} \\ S=r_1\cdot x=0.7\cdot 800=560\text{USD} \end{gathered}$$

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