The first calculating device is the? by Sunday | Jan 20 | Computer Studies WAEC | 0 comments A. Abacus B. Census machine C. Difference engine D. Napier bones. Correct Answer: Option A – Abacus Users Also Read These:An electrical device has 50 turns in its primary…An electric device is rated 2000W; 250V. The correct…Describe briefly the following terms (iv) peripheral…In calculating the total cost of a menu; it is…In calculating the total cost of a menu; it is…