The 1980 price is $1,500,000.
By now, I assume you mean 2017.
So, 2017 - 1980 = 37 years.
For 1981 = 1,500,000 • 0.10
For 1981 = $1,500,000 - $150,000
For 1981 = $1,350,000
Continue this process until reaching the year 2017. Use your calculator.
So, for 1982, what would you calculate?