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7.5 can be written an infinite number of ways; e.g. 75/10; 750/100; 7500/1000 along with many other ways.
You can arrange them as many times as you want. However, there are a limited number of orders to put them in, 10! (That's ten factorial, not an exclamation point.) 10x9x8x7x6x5x4x3x2x1 ways, or 3628800 ways.
how to decompose 10 and 8
Assuming the Ps and Is are indistinguishable: There are 10! / 3! / 3! = 100800 ways If the Ps and Is are distinguishable, then there are 10! = 3628800 ways
If there are no restrictions on duplicated numbers or other patterns of numbers then there are 10 ways of selecting the first digit and also 10 ways of selecting the second digit. The number of combinations is therefore 10 x 10 = 100.