When a machine is in US dollar and a Japanese needs to pay in Yen, the amount should be converted into Yen.
A US Made machine cost $500 
Exchange rate : 100 Yen = $1 
 In order to purchase the machine, a Japanese needs to pay:
 = Cost of the machine in dollars × Yen per dollar
 = $500 × 100 
 = 50,000 yen 
Therefore, a machine of $500 will cost a Japanese in 50,000 Yen.