#include<iostream>
using namespace std;


long long f(long long n, long long a, long long b) {
    return a * n + b;
}

long long floorSum(long long n, long long m, long long a, long long b) {
    if (n == 0) return 0;

    long long toAdd = (a / m) * n * (n - 1) / 2 + (b / m) * n;

    a %= m;
    b %= m;

    return toAdd + f(n - 1, a, b) / m + floorSum(f(n - 1, a, b) / m, a, m, f(n - 1, a, b) % m);
}


int L, R, K, C;

void read() {
    cin >> L >> R >> K >> C;
}


long long calc(int upto) {
    int N = upto / K;
    long long ret = 0;
    int p10 = 1;
    for (int nTh = 0; nTh < 9; ++nTh) {
        ret += floorSum(N + 1, p10 * 10, K, (10 - C) * p10) - floorSum(N + 1, p10 * 10, K, (9 - C) * p10);
        p10 *= 10;
    }
    return ret;
}


void work() {
    cout << calc(R) - calc(L - 1) << endl;
}


int main() {
    int T;
    cin >> T;
    for (int i = 0; i < T; ++i) {
        read();
        work();
    }
    return 0;
}