In 2010, 100 japanese yen purchased .88 u. s. dollars and in 2013, it purchased .93 u. s. dollars. how much was 1 u. s. dollar worth in japanese yen, in 2010 and 2013?

To find how many Japanese yen $1 was worth in 2010 and 2013, you will create ratios with the information we know and then solve for the number of yen.

2010:

100 yen    x yen  (use cross products to solve for x yen)
$0.88   =   $1
100 = 0.88x
0.88   0.88

x = 113.6 yen

In 2010, $1 was worth approximately 114 yen.

2013:

100 yen    x yen
$0.93   =   $1

100 = 0.93x
0.93   0.93
x = 107.5

In 2013, $1 was worth approximately 108 yen.