exam Maths Puzzle Numerical Ability

NO.1.How many number are there which consist of seven figures(digits)?

NO.2How many numbers not more than fours digits can be formed with 7,8,9?

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solve the equation by making appropriate substitution

(x)-2 - (8x)-1 + 10 = 0 An auto mechanic has total receipts of $1861.16 for a certain day. He determines that $1240 of this is labor. The remaining amount is for parts plus 6% sales tax on the parts only. Find the amount of the sales tax he collected.