Research shows that the value of god and the value of the dollar are inversely proportional. In 2016, gold cost $1200 per ounce and the dollar had a rating of 93 on the US dollar index. In 2017, the cost of the gold was $1300 per ounce. What was the 2017 rating of the dollar? Round to the nearest hundredth.

Given that the value of gold and the dollar index are inversely proportional, we can express this relationship as follows:

G \cdot D = k

For 2016:
1200 \cdot 93 = k

Calculate \( k \):
k = 111600

For 2017:
Let \( D_{2017} \) be the dollar index for 2017 when the gold cost was $1300 per ounce.

Use the relationship again:
1300 \cdot D_{2017} = 111600

Solve for \( D_{2017} \):
D_{2017} = \frac{111600}{1300}
D_{2017} = 85.84615385

Round to the nearest hundredth:
D_{2017} = 85.85

Answer: The 2017 rating of the dollar was 85.85.