def solve(A,B,C):
	A*=pow(10,C-1,B)
	A%=B
	return (A*10)//B
T=int(input())
ans=[0]*T
for i in range(T):
	a,b,c=map(int,input().split())
	ans[i]=solve(a,b,c)
for i in range(T):
	print(ans[i])