self Maths Puzzle

A number when devided D leaves a remainder of 8 and when devided by 3D leaves a remainder of 21.What is the remainder left,when twice the number is devided by 3D?
a)13 b)cannot be determined c)3 d)42

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self Other Question
s(D) denotes the sum of all natural numbers less than 100,containing the single digits natural number D as one of its digits.Find S(7)-S(3).option (1)220 (2)330 (3)440 (4)397 How many 9 digit numbers are possible by using the digits 1,2,3,4,5 which are divisible by 4 if therepetition is allowed?
a)5^7 b)5^6 c)5^9 d)5^8