To find the percentage decrease we need to subtract yesterday's price - the current price
Current price 2.84
yesterday price 2.90
2.90 - 2.84 = 0.06
This is the difference in prices
So to find the percentage we divide the difference with yesterday's price
0.06 / 2.90 = 0.0206
We multiply that value by 100 to get the final percentage
0.020 * 100 = 2.06
Finally, we take the answer to the nearest 10th
Answer = 2.1
This is because 6 is bigger than 5 so we take the Tenths position to 1.