If you set up a table like this you can start to see a pattern in the fractions that describe the percentage of sun protection.
The denominators are = the SPF and the numerators are = SPF - 1
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If you set up a table like this you can start to see a pattern in the fractions that describe the percentage of sun protection. The denominators are = the SPF and the numerators are = SPF - 1 |
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| SPF | 2 | 4 | 6 | 8 | 10 |
| % | 50% | 75% | 83(1/3)% | 87.5% | 90% |
| fraction=% | 1/2 | 3/4 | 5/6 | 7/8 | 9/10 |
So the first answer is 90% = 9/10 or an SPF of 10.
The second answer is 34/35 which is approximately 97.1%.
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