book Maths Puzzle Numerical Ability

Jake paid $100.70 including 6% tax for a color printer. How much did the printer itself cost? please write this as a algebra problem.

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i need help with this inequality:

3x-5<2 {integers}


when i tried this problem i +5 to both sides so the 5 would cancel out and then i divided 3x on both sides then i c
Could you tell me how to use prime factorization becausem i do not understand how to do it like say for example like 525 how could i turn that in to a prime factorization