Suppose at this time of the last year the exchange reate between US and Japan is 1 US Dollar worth 115 Japenese Yen. Now it becomes 1 US Dollar worth 95 Japanes Yen. Also suppose in the past year the inflaton rate is about 3& in US but 0% in Japan. Compute the percentage change of real exchange rate between US and Japan in the past year. Has US Dollar become weaker or stronger in real term?