a man was pointed in the grade of rs.7000-400-15000.in which year of his service will he be drawing salary of rs.10200

Here it is not clear if his salary is increasing monthly or yearly so assuming yearly.His salary in first year= Rs 7000now it is increasing Rs 400 per year  So, we have first term of AP = a = 7000 and common difference, d = 400Now an = 10200So an= a+n-1d10200=7000+n-1×4004n-4=102-704n=36n=9So in 9th year of his service his salary will be Rs 10200.

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