self Maths Puzzle

A,B,C are three points on a circle.The Tangent at A meets BC produced at T,angle BTA=38 degree,angle CAT=42 degree.The angle subtended by BC at the center of the circle is
1)86
2)96
3)116
4)124

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self Other Question

x race to y, y race to x then find the value of x n also y but x#y and y#x and also x#1, y#1 Depreciation applicable to an equipment is 20%.The value of the equipment 3 years from now will be less by