A student investigated the rate of decomposition of grass clippings at different temperatures. Table 1 shows the results after 30 days.
Table 1
| Temperature (°C) | Mass of grass clippings at start (g) | Mass of grass clippings after 30 days (g) | Decrease in mass (g) | Percentage decrease in mass (%) |
|---|---|---|---|---|
| 15 | 6.0 | 5.5 | 0.5 | 8.3 |
| 30 | 5.8 | 4.6 | 1.2 | 21 |
| 45 | 6.1 | 4.0 | 2.1 | 34 |
| 60 | 5.9 | 4.1 | 1.8 | 31 |
| 75 | 6.2 | 4.8 | 1.4 | ? |
| 90 | 6.5 | 6.3 | 0.2 | 3.1 |
Calculate the percentage decrease in mass for the grass clippings at 75 °C.
Give your answer to two significant figures.
