Answer
The problem does not change if we see other currency instead of US dollars.
Work Step by Step
To the previous problem the ratio between the price of goods $\left(P_{G}\right)$ and the price of services $\left(P_{S}\right)$ is $P_{G}=\frac{7}{8} P_{S}$ meaning for each value of $P_{S}$ we obtain a $P_{G}$ achieving needs. supposing that the prices are in US dollars and the exchange rate between Japanese yen and US dollars is
$y e n=r \cdot d o l l a r,$ where $r \in \mathbb{R}, r>0$ than the new prices are:
$J P_{G}=r \cdot P_{G}$ and $J P_{S}=r \cdot P_{S}$
So we note that by multiplying $P_{G}=\frac{7}{8} P_{S}$ by $r$ on both sides we get $r \cdot P_{G}=r \cdot P_{S} \frac{7}{8}$ which is equivalent with $J P_{G}=\frac{7}{8} J P_{S}$This is why we can conclude that regardess of currency the ratio between the price of good and the price of services remains constant.
